prefix compat with __ in case __dso_hidden is not available

avoid linker warning for compat symbols that are used internally in libc,
by introducing a hidden compat_foo() function, using that internally in
libc, and exposing foo as a strong alias to compat_fo

avoid linker warning for compat symbols that are used internally in libc,
by introducing a hidden compat_foo() function, using that internally in
libc, and exposing foo as a strong alias to compat_foo(). I am open for
better ideas.

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rename the macros ftsent_ since they apply to the ftsent struct not the
fts one.

Fix all the issues lint is too dumb to warn about and re-enable
-Wconstant-conversion.

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values t

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
builds)

approved by core@

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PR/42201: NAKAJIMA Yoshihiro: fts(3): broken compatibility
As new field types were added, we did not provide overrides for older compat
versions. This restores compatibility.

merge christos-time_t

Turn fts_number to a quad.

Unbreak fts13 after yesterdays header changes [yes I keep old binaries around
just to test this]

Restore the compatibility versions of fts not to do path mangling (i.e.
remove double slashes). Also make sure we free sp in all cases. From yamt,
many thanks!

compat core reorg.