glibc: fixed build of additional ABIs by creating an empty stubs header file for each ABI if needed

base/glibc/glibc.conf

@@ -21,6 +21,18 @@ pkg_glibc_postmake_headers() {
 		touch $root$includedir/bits/stdio_lim.h
 	[ -e $root$includedir/gnu/stubs.h ] ||
 		touch $root$includedir/gnu/stubs.h
+
+	# on multilib enabled builds create a stubs header file for each ABI
+	# TODO
+	# check if that approach is the right one or if we only have to
+	# create an empty stubs header for each additional ABI besides
+	# the default ABI
+	if [ "$SDECFG_MULTILIB" == 1 ] ; then
+		for x in $arch_abis; do
+			[ -e $root$includedir/gnu/stubs-$x.h ] ||
+				touch $root$includedir/gnu/stubs-$x.h
+		done
+	fi
 }
 
 # overwrite prefix to not point to the tools, but the real root for the headers