functions: rename eglibc to glibc and use 'unknown' for unknown libc

functions.sh.in

@@ -17,8 +17,8 @@ hostspec_to_libc() {
 	case "$1" in
 	*-*-*-uclibc*)	echo "uclibc" ;;
 	*-*-*-musl*)	echo "musl" ;;
-	*-*-*-gnu*)	echo "eglibc" ;;
-	*)		echo "uclibc" ;;
+	*-*-*-gnu*)	echo "glibc" ;;
+	*)		echo "unknown" ;;
 	esac
 }