sh-elf build failure on mainline

[Joern RENNECKE]

The build fails with:

/mnt/scratch/nightly/2006-06-14/sh-elf/./gcc/xgcc 
-B/mnt/scratch/nightly/2006-06-14/sh-elf/./gcc/ -nostdinc 
-B/mnt/scratch/nightly/2006-06-14/sh-elf/sh-elf/newlib/ -isystem 
/mnt/scratch/nightly/2006-06-14/sh-elf/sh-elf/newlib/targ-include 
-isystem /mnt/scratch/nightly/2006-06-14/srcw/newlib/libc/include 
-B/usr/local/sh-elf/bin/ -B/usr/local/sh-elf/lib/ -isystem 
/usr/local/sh-elf/include -isystem /usr/local/sh-elf/sys-include 
-L/mnt/scratch/nightly/2006-06-14/sh-elf/./ld -DHAVE_CONFIG_H 
-I/mnt/scratch/nightly/2006-06-14/srcw/boehm-gc/include -fexceptions 
-Iinclude -I././targ-include -I.//libc/include -O2 -g -O2 -fexceptions 
-Iinclude -I././targ-include -I.//libc/include -c 
../../../srcw/boehm-gc/allchblk.c -o allchblk.o
In file included from 
/mnt/scratch/nightly/2006-06-14/srcw/boehm-gc/include/private/gc_priv.h:70,
                 from ../../../srcw/boehm-gc/allchblk.c:19:
/mnt/scratch/nightly/2006-06-14/srcw/boehm-gc/include/private/gcconfig.h:462: 
error: expected identifier or '(' before '--' token
make[2]: *** [allchblk.lo] Error 1
make[2]: Leaving directory 
`/mnt/scratch/nightly/2006-06-14/sh-elf/sh-elf/boehm-gc'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory 
`/mnt/scratch/nightly/2006-06-14/sh-elf/sh-elf/boehm-gc'
make: *** [all-target-boehm-gc] Error 2

The attached patch alows the build to proceed past this obstacle, 
although I don't know how patches to this files are supposed to be 
handled, or if the build will eventually succeed.
Or why we need to cross-build boehm-gc for the target of a C / C++ / 
objc cross compiler in the first place.  We didn't one or two weeks ago.
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