Update PKGBUILD-split.proto allowed overrides

Commit 8a02abc disallowed overridding pkgver/pkgrel/epoch.  Update the
split package prototype to refelct this change.

Signed-off-by: Allan McRae <[email protected]>

Author: allanmcrae

proto/PKGBUILD-split.proto

@@ -49,9 +49,6 @@ check() {
 
 package_pkg1() {
 	# options and directives that can be overridden
-	pkgver=
-	pkgrel=
-	epoch=
 	pkgdesc=""
 	arch=()
 	url=""