Update build.sh boilerplate to match the current template

texinfo/build.sh

@@ -1,10 +1,7 @@
 #!/bin/bash
-#
-# This is a generic build.sh script
-# It can be used nearly unmodified with many packages
-# 
+# This is a buildpkg build.sh script
 # build.sh helper functions
-. ${BUILDPKG_BASE}/scripts/build.sh.functions
+. ${BUILDPKG_SCRIPTS}/build.sh.functions
 #
 ###########################################################
 # Check the following 4 variables before running the script
@@ -16,7 +13,7 @@ source[0]=$topdir-$version.tar.gz
 #patch[0]=
 
 # Source function library
-. ${BUILDPKG_BASE}/scripts/buildpkg.functions
+. ${BUILDPKG_SCRIPTS}/buildpkg.functions
 
 # Global settings
 export CPPFLAGS="-I$prefix/include"