Add support for modular build structure. (#136)

build.jam

@@ -3,6 +3,8 @@
 # (See accompanying file LICENSE_1_0.txt or copy at
 # http://www.boost.org/LICENSE_1_0.txt)
 
+require-b2 5.2 ;
+
 #|
 This B2 project provides support for using the Predef library externally as
 a standalone project. To use externally you would need a `use-project`

test/build.jam

@@ -3,6 +3,7 @@
 # (See accompanying file LICENSE_1_0.txt or copy at
 # http://www.boost.org/LICENSE_1_0.txt)
 
+import-search ../tools/check ;
 import predef : require check : predef-require predef-check ;
 import common ;
 import path ;