xbps-src: gawk is required by glibc, so detect it.

xbps-src/xbps-src.sh.in

@@ -51,7 +51,7 @@ check_reqhost_utils()
 {
 	[ -n "$in_chroot" ] && return 0
 
-	for f in awk bash sed gcc msgfmt patch makeinfo perl fakeroot \
+	for f in gawk bash sed gcc msgfmt patch makeinfo perl fakeroot \
 		xbps-bin.static xbps-repo.static xbps-uhelper.static; do
 		if ! command -v ${f} 2>&1 >/dev/null; then
 			echo "${f} is missing in your system, can't continue! exiting..."