[patch] fix release builds for arm-linux-gnueabi

[Matthias Klose]

the 2.20 release tarball fails to build on arm-linux-gnueabi; know expands 
something else than for builds from cvs or for snapshot releases. this should go 
to the branch and trunk (although you'll never see it there).

   Matthias

gcc -DHAVE_CONFIG_H -I. -I../../gas  -I. -I../../gas -I../bfd -I../../gas/config 
-I../../gas/../include -I../../gas/.. -I../../gas/../bfd 
-DLOCALEDIR="\"/usr/share/locale\""  -W -Wall -Wstrict-prototypes 
-Wmissing-prototypes -Werror -g -O2 -Wno-format-security -fno-section-anchors 
-MT tc-arm.o -MD -MP -MF .deps/tc-arm.Tpo -c -o tc-arm.o `test -f 
'config/tc-arm.c' || echo '../../gas/'`config/tc-arm.c
cc1: warnings being treated as errors
../../gas/config/tc-arm.c: In function 'make_mapping_symbol':
../../gas/config/tc-arm.c:2489: error: suggest braces around empty body in an 
'if' statement
make[5]: *** [tc-arm.o] Error 1
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