Remove .res specs to fix COFF passthrough [PR123504]

Remove .res specs to fix COFF passthrough [PR123504]

Some packages (gnulib) pass COFF object files with .res extension
directly to gcc, expecting them to be passed through to the linker,
instead of windres.  However, the current EXTRA_DEFAULT_COMPILERS spec
intercepts all .res files and runs them through windres, which fails for
COFF files that are not Windows resource files (Microsoft Visual C
binary resource file as identified by libmagic/file).

This patch removes the .res file specs, leaving only the .rc
support specs active. At a later date, this can be reviewed.

The driver could inspect the .res file to see if it's a object file or,
but, it's somewhat questionable if handling .res is even useful.

gcc/ChangeLog:

	PR driver/123504
	* config/i386/cygming.h (EXTRA_DEFAULT_COMPILERS): Comment out
	.res spec to allow COFF files with .res extension to pass
	through to the linker.
	* config/aarch64/cygming.h (EXTRA_DEFAULT_COMPILERS): Likewise.

Signed-off-by: Jonathan Yong <10walls@gmail.com>