Add tests for winapi submodule

status/Jamfile.v2

@@ -178,6 +178,7 @@ run-tests libs :
     uuid/test                   # test-suite uuid
     variant/test                # test-suite variant
     wave/test/build             # test-suite wave
+    winapi/test                 # test-suite winapi
     xpressive/test              # test-suite xpressive
     ;