foomatic-db-engine: changed to install perl modules into perl's 'vendor' directory

Note:

According to http://search.cpan.org/dist/perl/INSTALL#Installation_Directories
this is the right place for distributions which build binary packages of perl
add-on modules.

printing/foomatic-db-engine/foomatic-db-engine.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../foomatic-db-engine/foomatic-db-engine.conf
-# Copyright (C) 2007 The OpenSDE Project
+# Copyright (C) 2007 - 2012 The OpenSDE Project
 #
 # More information can be found in the files COPYING and README.
 #
@@ -13,3 +13,5 @@
 # --- SDE-COPYRIGHT-NOTE-END ---
 
 hook_add preconf 5 './make_configure'
+
+var_append makeopt ' ' "PERL_INSTALLDIRS=vendor"