Use common.file-creation-command for creating a file signalling

that unit test has executed without errors. Using 'touch' is not
portable to Windows, in general.


[SVN r21837]

tools/build

@@ -1 +1 @@
-Subproject commit 16d8c8005a4ae1a181cd3dcd97f752e89c30ce61
+Subproject commit 3044074f7ce52348ad518b26e50c7f5153583700