3.0 bootstrap broken on irix6.5

[Billinghurst, David (CRTS)]

3.0 bootstrap is broken when using cc on irix6.5.  We are passing gcc flags
to cc when compiling gengenrtl.o in stage2, giving

make[1]: Entering directory `/exd4/billingd/obj/gcc-3.0/gcc'
make CC="stage1/xgcc -Bstage1/
-B/exd4/billingd/tmp/gcc-3.0/mips-sgi-irix6.5/bin/" \
         STAGE_PREFIX=stage1/ \
         HOST_CC="cc" CFLAGS="-g -O2" LDFLAGS=""
WARN_CFLAGS="\$(GCC_WARN_CFLAGS)" STRICT_WARN="-Wtraditional -pedantic
-Wno-long-long" libdir=/exd4/billingd/tmp/gcc-3.0/lib LANGUAGES="c gcov c++
f77 java objc" MAKEOVERRIDES= OUTPUT_OPTION="-o \$@"
make[2]: Entering directory `/exd4/billingd/obj/gcc-3.0/gcc'
cc -c  -DIN_GCC    -g -O2 -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long  -DHAVE_CONFIG_H
-DGENERATOR_FILE    -I. -I. -I/exd4/billingd/src/gcc-3.0/gcc
-I/exd4/billingd/src/gcc-3.0/gcc/. -I/exd4/billingd/src/gcc-3.0/gcc/config
-I/exd4/billingd/src/gcc-3.0/gcc/../include
/exd4/billingd/src/gcc-3.0/gcc/gengenrtl.c
cc ERROR parsing -W:  bad syntax for option
cc WARNING:  phase key (-)  is no longer supported
cc ERROR parsing -W:  bad phase for -W option
cc WARNING:  phase key (W)  is no longer supported