libmagic: Don't export libzstd symbols.

Fixes part of:

PR lib/58842: libmagic leaks private and zstd symbols

Prompted by work on:

PR lib/58838: shared libraries in base should all have expsym lis

libmagic: Don't export libzstd symbols.

Fixes part of:

PR lib/58842: libmagic leaks private and zstd symbols

Prompted by work on:

PR lib/58838: shared libraries in base should all have expsym lists

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make zstd a private library (for now)

merge conflicts between file-5.43 and file-5.45

introduce new GCC 12 warning disables and use them in a few places

this introduces 4 new warning disable flags:

CC_WNO_MISSING_TEMPLATE_KEYWORD
CC_WNO_REGISTER
CC_WNO_STRINGOP_OVERREAD

introduce new GCC 12 warning disables and use them in a few places

this introduces 4 new warning disable flags:

CC_WNO_MISSING_TEMPLATE_KEYWORD
CC_WNO_REGISTER
CC_WNO_STRINGOP_OVERREAD
CC_WNO_ARRAY_BOUNDS

and documents them in README.warnings. of these, the string op
and array bounds are both problematic (real bugs) and also spurious
(not real bugs), and the other 2 are mostly temporary for older
3rd party code.

add some new uses of CC_WNO_STRINGOP_OVERFLOW.

fix m68k build for gallium and GCC 12.

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adapt to ${CC_WNO_MAYBE_UNINITIALIZED}

Use ${CC_WNO_MAYBE_UNINITIALIZED} instead of
the older style more complex expressions.

Remove workarounds if they were for a specific
version of gcc < 10.

Fix sun2 (static linking)

Add more libraries

merge conflicts

turn off various warnings for various things:

- file has looks bogus maybe-uninitialized
- llvm triggers an attribute violation:
ScheduleDAGInstrs.cpp:1430:14: error: declaration of
'llvm::raw

turn off various warnings for various things:

- file has looks bogus maybe-uninitialized
- llvm triggers an attribute violation:
ScheduleDAGInstrs.cpp:1430:14: error: declaration of
'llvm::raw_ostream& llvm::operator<<(llvm::raw_ostream&, const llvm::ILPValue&)'
with attribute 'noinline' follows inline declaration [-Werror=attributes]
- ntp and pkg_install have obvious restrict violations, should be
fixed but i'm avoiding patching upstream code in this pass
- tftp has an array bounds that doesn't seem real issue
- sysinst's partman.c has major problem with passing the same
string as source and dest in snprintf, as a way to strcat
with formatting which trip restrict violations. non trivial
to fix so for now the warning is elided.
- Xext's XEVI.c has similar issue as partman.c

everyone and GCC 8 gets these warnings turned off for now:

-Wno-format-truncation
-Wno-stringop-overflow
-Wno-stringop-truncation
-Wno-cast-function-type

as they trip a large amount of code. most of them should be
investigated, but the few i looked at were not finding actually
real bugs, vs instances of poor coding, so skipping for now.

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Use DPSRCS for magic.h. OK'd by Christos.

Merge conflicts

merge conflicts for file-5.33

fix der.c bump shared library

Build magic.h before all objs.

Finish version auto-setting.

Get version from the configure script

add to CLEANFILES at some places, for generated files

merge new file

fix non-literal strings where they are not needed.

build glue and lint fixes