Waybar: add update file, fix clean-up.

- It was finding weird matches.
- Clean-up was leaving the date library around.

srcpkgs/Waybar/template

@@ -2,6 +2,8 @@
 pkgname=Waybar
 version=0.9.2
 revision=1
+create_wrksrc=yes
+build_wrksrc=${pkgname}-${version}
 build_style=meson
 configure_args="-Dgtk-layer-shell=enabled -Dlibudev=enabled -Dman-pages=enabled
  -Dsystemd=disabled
@@ -37,8 +39,8 @@ desc_option_libnl="Enable libnl support for network related features"
 desc_option_dbusmenugtk="Enable support for tray"
 desc_option_mpd="Enable support for MPD"
 
-pre_configure() {
-	cp -rv ../date-2.4.1 subprojects/
+post_extract() {
+	mv date-2.4.1 ${build_wrksrc}/subprojects/
 }
 
 post_install() {

srcpkgs/Waybar/update

@@ -0,0 +1,2 @@
+site="https://github.com/Alexays/Waybar/releases"
+pattern='"/Alexays/Waybar/tree/\K[\d.]+(?=")'