Added jamfile caching to the build.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2019 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tools/jam/Jamfile

@@ -54,6 +54,7 @@ if $(OS) = NT 			{ CCFLAGS += /DNT ; }
 # Include header caching.
 #
 DEFINES += OPT_HEADER_CACHE_EXT ;
+DEFINES += OPT_JAMFILE_CACHE_EXT ;
 #
 ### LOCAL CHANGE
 
@@ -77,6 +78,7 @@ if $(YACC) && $(SUFEXE) = ""
 # 
 # These files contain locally developed improvements.
 #
+code += jcache.c ;
 # code primarily not written locally, but grabbed from the net
 code += hcache.c ;
 #