Disambiguiate targets and directories passed to 'build-project'.

Previously, if a Jamfile had:
    exe a : a.cpp ;
    build-project a ;
where a is also a subdirectory, we'd get error.


[SVN r61054]

v2/build/targets.jam

@@ -288,7 +288,7 @@ class project-target : abstract-target
         local self-location = [ get location ] ;
         for local pn in [ get projects-to-build ]
         {
-            result += [ find $(pn) ] ;
+            result += [ find $(pn)/ ] ;
         }
 
         return $(result) ;

v2/test/build_dir.py

@@ -36,6 +36,7 @@ t.expect_addition(["build/$toolset/debug/a.exe",
 
 # Test that building from child projects work.
 t.run_build_system(subdir='src')
+t.ignore("build/config.log")
 t.expect_nothing_more()
 
 # Test that project can override build dir.