Lots of warnings

[paulfloyd]

ld: warning: object file (../coregrind/libcoregrind-amd64-darwin.a(libcoregrind_amd64_darwin_a-syscall-arm64-linux.o)) was built for newer macOS version (13.0) than being linked (10.6)

Could probably make this version dependent

ld: warning: building for macOS 10.6 is deprecated

That's ancient

m_libcfile.c:1402:15: warning: variable 'res2' set but not used [-Wunused-but-set-variable]
m_signals.c:1648:8: warning: variable 'r' set but not used [-Wunused-but-set-variable]
m_initimg/initimg-darwin.c:63:11: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
m_syswrap/syswrap-darwin.c:2281:17: warning: variable 'tst' set but not used [-Wunused-but-set-variable]
m_syswrap/syswrap-darwin.c:8504:11: warning: variable 'complex_header_size' set but not used [-Wunused-but-set-variable]