Rework how $revision is used. Works much better in all cases.

$version is not modified anymore.

--HG--
extra : convert_revision : a83408f47e22db2f34cd33d6d47eb2f045ae2758

shutils/build_funcs.sh

@@ -31,7 +31,7 @@ build_src_phase()
 {
 	local pkgparam="$1"
 	local pkg="$pkgname-$version"
-	local f=
+	local f
 
 	[ -z $pkgparam ] && [ -z $pkgname -o -z $version ] && return 1
 
@@ -47,6 +47,8 @@ build_src_phase()
 
 	cd $wrksrc || exit 1
 
+	[ -n "$revision" ] && pkg="${pkg}_${revision}"
+
 	# cross compilation vars.
 	if [ -n "$cross_compiler" ]; then
 		. $XBPS_HELPERSDIR/cross-compilation.sh