glibc: fixed build of 32 Bit library on x86-64 when multilib is enabled

Note:

We need to inject proper -march while building 32 Bit ABI

base/glibc/glibc.conf

@@ -69,6 +69,16 @@ pkg_glibc_abi_preconf() {
 	slibdir="lib$1"
 	echo_status "slibdir: $slibdir"
 
+	# architecture specific compiler flags for 32bit ABIs
+	if [ "$1" = "32" ]; then
+		case "$arch" in
+			x86-64) 
+				var_append CC_WRAPPER_INSERT ' ' "-march=$( cut -d- -f1 <<< $arch_target )"
+				var_append CXX_WRAPPER_INSERT ' ' "-march=$( cut -d- -f1 <<< $arch_target )"
+				;;
+		esac
+	fi
+
 	# applies to all additional ABIs while building multilib
 	if [ $buildloop -ge 2 ]; then
 		# only install libraries and no programs