configure.ac: drop -Wl,--fatal-warnings

Drop -Wl,--fatal-warnings with --enable-static to avoid the following
static build failure:

configure:4778: checking for strtod
configure:4778: /home/autobuild/autobuild/instance-8/output-1/host/bin/powerpc-buildroot-linux-uclibcspe-gcc -o conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -mabi=spe -mfloat-gprs=single -Wa,-me500 -Os -g0  -static -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -static -Wl,--fatal-warnings conftest.c  >&5
/home/autobuild/autobuild/instance-8/output-1/host/lib/gcc/powerpc-buildroot-linux-uclibcspe/8.4.0/../../../../powerpc-buildroot-linux-uclibcspe/bin/ld: warning: conftest has a LOAD segment with RWX permissions
collect2: error: ld returned 1 exit status

[...]

In file included from arith_yylex.c:44:
system.h:74:22: error: static declaration of 'strtod' follows non-static declaration
 static inline double strtod(const char *nptr, char **endptr)
                      ^~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/a54fdc7d1b94beb47203373ae35b08d9cea8d42c

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
1 file changed