various build-blocks adapted to new build system

scripts/Libraries/giflib/build

@@ -1,13 +1,11 @@
-#!/bin/bash
+#!/usr/bin/env modbuild
 
-source "$(dirname $0)/../../../lib/libpmodules.bash"
-
-pmodules.configure() {
+pbuild::configure() {
 	"${MODULE_SRCDIR}"/configure \
 		--prefix="${PREFIX}" \
 		|| exit 1
 }
 
-pmodules.add_to_group 'Libraries'
-pmodules.set_build_dependencies "${COMPILER}"
-pmodules.make_all
+pbuild::add_to_group 'Libraries'
+pbuild::set_build_dependencies "${COMPILER}"
+pbuild::make_all