[CRT] Fix link issues with __ftol2 when compiling for NT6

__ftol2 is exported from msvcrt on NT6+, not from ntdll for some reason. So native apps still need to statically link _ftol2 and _ftoul2_leg

[CRT] Fix link issues with __ftol2 when compiling for NT6

__ftol2 is exported from msvcrt on NT6+, not from ntdll for some reason. So native apps still need to statically link _ftol2 and _ftoul2_legacy, but apps linking to msvcrt only need to statically link _ftoul2_legacy (via msvcrtex), when on NT6+.

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[CRT] Add mbrtowc (from wine)

[CRT] Add wcrtomb (from wine)

[MSVCRTEX] Only include _CrtDbgReport*, if we don't already export them (#6797)

* [MSVCRTEX] Only include _CrtDbgReport*, if we don't already export them

For some reason clang builds now want the

[MSVCRTEX] Only include _CrtDbgReport*, if we don't already export them (#6797)

* [MSVCRTEX] Only include _CrtDbgReport*, if we don't already export them

For some reason clang builds now want the ___chkstk_ms on x64 as well, so add it.

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[CRT] Move rand_s into it's own file

[CPPRT][CRT][MSVCRT] Move __CxxFrameHandler3 to crt and export it on NT6

Previously it was in cpprt, which is a support library for C++, containing functions that are not exported by msvcrt. But sin

[CPPRT][CRT][MSVCRT] Move __CxxFrameHandler3 to crt and export it on NT6

Previously it was in cpprt, which is a support library for C++, containing functions that are not exported by msvcrt. But since Vista __CxxFrameHandler3 is exported by msvcrt. Therefore move it to crt, and to satisfy pre-Vista configurations, also add it to msvcrtex.

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[CRT] Add simplistic fallback implementation of sincos to make GCC 11 happy

[CRT] Add round and roundf and add it to msvcrtex to make clang v14 happy

[CMAKE] Elimitate the use of GCC and CLANG variables

[FORMATTING] Remove trailing whitespace. Addendum to 34593d93.

Excluded: 3rd-party code (incl. wine) and most of the win32ss.

[CRT/ARM] Integer to float conversion implementation (#3866)

CORE-17713 CORE-17706 CORE-17604

[CRT] Improve CMake files

[CRT] Fix _fmode

Remove mingw-w64 version of _fmode. _fmode should not be linked directly into the executable. Instead, the export from msvcrt should be used. On Windows 10 it's defined to *__p__fmo

[CRT] Fix _fmode

Remove mingw-w64 version of _fmode. _fmode should not be linked directly into the executable. Instead, the export from msvcrt should be used. On Windows 10 it's defined to *__p__fmode(), which is exported from ucrtbase.dll
Also _fmode in msvcrt.dll is initialized with 0.

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[MSVCRTEX] Add some routines required for clang optimizations

- Include exp2* in all clang builds
- Include __aulldiv for i386 ones

Those are required, at least for clang-cl Release configuration

[ARM/CRT] Refactor several functions (#3865)

- Make __fto64 function more readable
- Call worker function directly for __rt_sdiv/udiv
- Adapt __rt_sdiv64/udiv64 asm shims accordingly
- Add header fi

[ARM/CRT] Refactor several functions (#3865)

- Make __fto64 function more readable
- Call worker function directly for __rt_sdiv/udiv
- Adapt __rt_sdiv64/udiv64 asm shims accordingly
- Add header files to CMake source list

CORE-17607 CORE-17614 CORE-17703 CORE-17604

Addendum to f2bc1f0e, e448094e and 54406bf4.

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[CRT/ARM] __fto64: Assembly wrappers are actually not needed anymore

Addendum to e448094e. CORE-17703 CORE-17604

[CRT/ARM] Implement __dtoi64/dtou64/stoi64/stou64 functions (#3848)

CORE-17703 CORE-17604

[CRT] Fix _matherror and _setusermatherror

We previously used 2 different versions: one from wine and one from mingw-w64.
The former was used in msvcrt, the latter was statically compiled into the e

[CRT] Fix _matherror and _setusermatherror

We previously used 2 different versions: one from wine and one from mingw-w64.
The former was used in msvcrt, the latter was statically compiled into the executable. When using MS libs, there is only one _matherr, which is statically linked into the executable and does nothing (it's not really a function for users to be called).
_setusermatherror should only exist in msvcrt and not statically, which wouldn't work at all.

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[CRT] Add a generic C version of exp2(f) and use it for all architecture

[MSVCRTEX] Do not include _CI* math functions

They are exported by msvcrt
CORE-17423

[CMAKE] Fix MSVC configuring

[CMAKE] Fix GCC -fstack-protector usage

[CMAKE] Turn import libs into regular C static libs

Embed msvcrtex into libmsvcrt

Idea taken from Thomas Faber

[MSVCRTEX] Add some floating point functions for CLang build

Clang makes optimisations requiring functions not present in msvcrt

[CMAKE] Use an INTERFACE library to perform the msvcrt <-> msvcrtex binding