[Boost-build] alias.jam patch, removing some unnecessary imports.

From: Jurko Gospodnetiæ (jurko.gospodnetic_at_[hidden])
Date: 2007-12-22 23:10:51

   Hi.

   I'm attaching a patch removing some unnecessary import calls from the 
alias.jam file.

   Best regards,
     Jurko Gospodnetiæ

Left base folder: X:\Boost_Build\20071222_nightly_build\Original\boost-build
Right base folder: X:\Boost_Build\\20071222_nightly_build\Modified\boost-build
--- alias.jam	2007-12-21 15:33:44.000000000 +-0100
+++ alias.jam	2007-12-23 05:06:14.000000000 +-0100
@@ -21,16 +21,13 @@
 #
 #    alias big_lib : : @/external_project/big_lib/<link>static ;
 #
 
 import targets ;
 import "class" : new ;
-import property ;
 import errors : error ;
-import type : type ;
-import regex ;
 import project ;
 import property-set ;
 
 class alias-target-class : basic-target 
 {
     rule __init__ ( name : project : sources * : requirements *