netbsd-wtf: use fixed date and specific git commit.

srcpkgs/netbsd-wtf/template

@@ -1,6 +1,6 @@
 # Template file for 'netbsd-wtf'
 pkgname=netbsd-wtf
-version="$(date -u +%Y%m%d)"
+version=20130128
 revision=1
 build_style=gnu-makefile
 make_build_args="DATADIR=/usr/share"
@@ -25,4 +25,5 @@ do_fetch() {
 	local url="git://github.com/voidlinux/netbsd-wtf"
 	msg_normal " Fetching source from $url ...\n"
 	git clone ${url} ${pkgname}-${version}
+	cd ${pkgname}-${version} && git checkout 5888f8b
 }