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This reverts commit 1a8fb943.

By replacing the `-f 2` field selection with `-f 2-`, we select fields
2 and beyond, so that arguments containing the '=' character are not
truncated.

This option qualifier list format is POSIX standard and tested
to work with the `cut` program from:
* GNU coreutils
* macOS (FreeBSD)
* NetBSD
* toybox
* busybox
* uutils-coreutils

In my case, this is useful because I'm trying to use an installation
prefix which contains an equals sign.

- E.g. "tcc version 0.9.27 mob:675046bd (x86_64 Windows)"
- WIN32: Replaced compiler opt -O1 and -Os with -O2 (only 1% larger executable).

271 insertions(+), 292 deletions(-), -21 lines, -5 files
Also:
- tccdefs.h: WIN32: less (no) __builtins
- libtcc.c: simply ignore -arch

Netbsd uses __UINTPTR_TYPE__ to detect gcc in machine/int_types.h

Currently used only with 'tcc_compile_sem' to protect
tcc_compile(),  but can be used with other semaphores

Also fix deadlock when tcc_enter_state() is called
recursively for the same state, for example with
tcc_warning() from #pragma comment(option,"...")

Also:
- libtcc.c: error1(): use cstr_[v]printf()
- tcc.h: set TCC_USING_DOUBLE_FOR_LDOUBLE for macho-arm64
  (rather than for macho-X86_64)
- tcc.h: define TCC_TARGET_MACHO on __APPLE__ by default
- tcc.h: cleanup TCCState, move DEFASM token stuff to tcctok.h
- tccgen.c: more static
- Makefile/tcc.c: review githash
- tccpe/tcctools: use read() instead of fgets() in pe_load_def()
  (all files opened by tcc for reading are now read via 'int fd')
- configure/win32: don't preset CONFIG_TCCDIR (to allow to override it)
- tcc.c -bench: do not include output/run-time

136 insertions(+), 226 deletions(-), less 90 lines (except tests)
only one set_flag() function required
* can now turn off specific errors: -Werror -Wno-error=option
* new interface: tcc_warning_c(warn_option)("format", args...);
* new warning: -Wdiscarded-qualifiers (on by default)
* new variable 'warn_all' for conditional warnings with -Wall
see also the tests

configure:
- re-enable apple M1-arm64
- however, with --cpu=x86_64,  set -arch in CFLAGS/LDFLAGS too
  (assume rosetta)

Makefile:
- re-enable osx cross-test (Please do not disable tests)

tcc.h
- set TCC_IS_NATIVE for TCC_TARGET_MACHO on __APPLE__
- apply TCC_USING_DOUBLE_FOR_LDOUBLE for x86_64-osx

libtcc.c:
- cleanup tcc_add_file_internal()
- new function char *tcc_load_text(int fd); and use it for tbd files

On Big Sur M1, force a x86_64 native build and count on Rosetta to make job as arm64 is not yet supported.

Supports linking using .tbd definitions found in the default installed
command-line tools SDK or Xcode.app SDK. Only for creating executables
(not yet for `tcc -run`).

Add support for some more options to generate dependency fragments.
-M is likes -MD but doesn't compile anything so the command won't fail
when just supplied a file without all the relevant libs.
-MM and -MMD are like their counterparts but skip system libs.

Note the behavior of -MD has changed to include system libs. Use -MMD
for the old behavior. This matches gcc's corresponding flags

If a dash ("-") is specified to -MF, write to stdout instead of a file
called "-"

gcc compiles .h files as .c source code, tcc now does the same and no longer complains with "unrecognized file type". It is however adviced to use "-x c" option which exists for this purpose in gcc and was supported by tcc.