Simplify templates by not needing $patch_files in some cases.

If exists a patch called $pkgname-fix-{build,install}.diff in the
templates directory, they will be applied automatically. If patches
are named differently $patch_files must be used yet.

--HG--
extra : convert_revision : 21f6edfab580c569b3737280f54a6332c44baa49

xbps.sh

@@ -611,6 +611,14 @@ apply_tmpl_patches()
 	local patch=
 	local i=
 
+	# Apply some build/install patches automatically.
+	if [ -f $XBPS_TEMPLATESDIR/$pkgname-fix-build.diff ]; then
+		patch_files="$pkgname-fix-build.diff $patch_files"
+	fi
+	if [ -f $XBPS_TEMPLATESDIR/$pkgname-fix-install.diff ]; then
+		patch_files="$pkgname-fix-install.diff $patch_files"
+	fi
+
 	#
 	# If package needs some patches applied before building,
 	# apply them now.