nautilus: fix gcc6 build

srcpkgs/nautilus/template

@@ -1,7 +1,7 @@
 # Template file for 'nautilus'
 pkgname=nautilus
 version=3.18.5
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--disable-update-mimedb --disable-debug
  --disable-schemas-compile --disable-nst-extension $(vopt_enable gir introspection)"
@@ -21,6 +21,11 @@ if [ -z "$CROSS_BUILD" ]; then
 	build_options_default="gir"
 fi
 
+_gccver=$(gcc --version | awk '/^gcc \(GCC\)/ { print $3 }')
+if [ "${_gccver%%.*}" -gt 5 ]; then
+	CFLAGS="-Wno-error=format-nonliteral"
+fi
+
 libnautilus_package() {
 	short_desc+=" - shared libraries"
 	pkg_install() {