makepkg: svn: update existing sources in srcdir without removing them first.

This matches the behaviour with non-VCS sources. It also allows incremental
builds when subversion is used to obtain sources.

Signed-off-by: Lukáš Jirkovský <l.jirkovsky@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/makepkg.sh.in

@@ -769,12 +769,8 @@ extract_svn() {
 	repo=${repo%%#*}
 
 	msg2 "$(gettext "Creating working copy of %s %s repo...")" "${repo}" "svn"
-	pushd "$srcdir" &>/dev/null
-	rm -rf "${dir##*/}"
 
-	cp -a "$dir" .
-
-	popd &>/dev/null
+	cp -au "$dir" "$srcdir"
 }
 
 get_all_sources() {