protect access to the gnu warning map with a mutex to avoid random crashes

discussed with, tested by and ok tb@

merge lld-16.0.6

add .gnu.warning.SYMBOL support to ld.lld(1) to display the warnings in
these sections like ld.bfd(1)

e.g:
add.c(add.o:(add)): warning: sprintf() is often misused, please use snprintf()
add.c(add.o:

add .gnu.warning.SYMBOL support to ld.lld(1) to display the warnings in
these sections like ld.bfd(1)

e.g:
add.c(add.o:(add)): warning: sprintf() is often misused, please use snprintf()
add.c(add.o:(add)): warning: strcpy() is almost always misused, please use strlcpy()
add.c(add.o:(add)): warning: strcat() is almost always misused, please use strlcat()

ok deraadt@

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lld: do not report undefined weak references in shared libraries

https://github.com/llvm/llvm-project/commit/52bfd2c1ccd86ff813ee6df5a6700690acdd912f

This fixes an issue introduced in D101996.

A w

lld: do not report undefined weak references in shared libraries

https://github.com/llvm/llvm-project/commit/52bfd2c1ccd86ff813ee6df5a6700690acdd912f

This fixes an issue introduced in D101996.

A weak reference in a shared library could be incorrectly reported if
there is another library that has a strong reference to the same symbol.

Differential Revision: https://reviews.llvm.org/D115041

ok patrick@ kettenis@

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Import LLVM 13.0.0 release.

Import LLVM 11.1.0 release including clang, lld and lldb.

Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty