COLLECT_GCC_OPTIONS broken on trunk and gcc-3.0 branch

[David Edelsohn]

	Rainer's patch has broken COLLET_GCC_OPTIONS.  With his patch,
COLLECT_GCC_OPTIONS on AIX is *empty*.  When building libgcc2, before his
patch, collect2 shows:

COLLECT_GCC_OPTIONS = '-B./' '-O2' '-DIN_GCC' '-W' '-Wall'
'-Wwrite-strings' '-W strict-prototypes' '-Wmissing-prototypes' '-isystem'
'./include' '-g1' '-DHAVE_G THR_DEFAULT' '-DIN_LIBGCC2'
'-D__GCC_FLOAT_NOT_NEEDED' '-shared' '-nodefaultlibs ' '-o' 'fooshr.o'
'-maix64'

After his patch:

COLLECT_GCC_OPTIONS is not present whatsoever.

	This causes errors like:

ld: 0711-738 ERROR: Input file /tmp//ccwSK62O.o:
        XCOFF32 object files are not allowed in 64-bit mode.

when bootstrapping on AIX because collect2 does not invoke xgcc with the
-maix64 option.

	This is a regression from gcc-3.0.  I am opening a PR and marking
it as high priority.  This causes build failures on both the trunk and the
branch. 

David