libgo: fix makefile buglet

    
    Fix a small bug in the libgo Makefile recipe that constructs the
    directory from which to pick up libgcc_s.so ; the gccgo invocation
    with -print-libgcc-file-name was missing the flags, which meant that
    for -m32 builds we'd see the 64-bit libgcc dir.
    
    Reviewed-on: https://go-review.googlesource.com/78836

From-SVN: r254984

gcc/go/gofrontend/MERGE

-5485b3faed476f6d051833d1790b5f77be9d1efc
+fecb92bda0aa6d70c89d14635ff568df77d2bb5f
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/Makefile.am

@@ -1001,7 +1001,7 @@ CHECK = \
 	export MAKE; \
 	NM="$(NM)"; \
 	export NM; \
-	libgccdir=`${GOC} -print-libgcc-file-name | sed -e 's|/[^/]*$$||'`; \
+	libgccdir=`${GOC} ${GOCFLAGS} -print-libgcc-file-name | sed -e 's|/[^/]*$$||'`; \
 	LD_LIBRARY_PATH="`${PWD_COMMAND}`/.libs:$${libgccdir}:${LD_LIBRARY_PATH}"; \
 	LD_LIBRARY_PATH=`echo $${LD_LIBRARY_PATH} | sed 's,::*,:,g;s,^:*,,;s,:*$$,,'`; \
 	export LD_LIBRARY_PATH; \

libgo/Makefile.in

@@ -1135,7 +1135,7 @@ CHECK = \
 	export MAKE; \
 	NM="$(NM)"; \
 	export NM; \
-	libgccdir=`${GOC} -print-libgcc-file-name | sed -e 's|/[^/]*$$||'`; \
+	libgccdir=`${GOC} ${GOCFLAGS} -print-libgcc-file-name | sed -e 's|/[^/]*$$||'`; \
 	LD_LIBRARY_PATH="`${PWD_COMMAND}`/.libs:$${libgccdir}:${LD_LIBRARY_PATH}"; \
 	LD_LIBRARY_PATH=`echo $${LD_LIBRARY_PATH} | sed 's,::*,:,g;s,^:*,,;s,:*$$,,'`; \
 	export LD_LIBRARY_PATH; \