Fix build without native symlinks
https://bugs.gentoo.org/744424

--- a/configure
+++ b/configure
@@ -1026,9 +1026,9 @@ void _ebcdic() { char* s = (char*) ebcdi
 int main() { _ascii (); _ebcdic (); return 0; }
 EOF
 $CXX $CXXFLAGS -c -o $TMPO.o tmp_endianness_check.cpp
-if strings $TMPO.o | grep BIGenDianSyS >/dev/null; then
+if ${STRINGS} $TMPO.o | grep BIGenDianSyS >/dev/null; then
 	_endian=big
-elif strings $TMPO.o | grep LiTTleEnDian >/dev/null; then
+elif ${STRINGS} $TMPO.o | grep LiTTleEnDian >/dev/null; then
 	_endian=little
 fi
 echo $_endian;