Patch from Andre Hentz.

Change the test system to use "exec*", not "system". This is needed to
avoid espacing shell metacharacters.


[SVN r18156]

tools/build

@@ -1 +1 @@
-Subproject commit 4177e8e5ccbfc0ac231c6a0011ed347cc784343a
+Subproject commit 7a0cd86cfc85fb1f4786c7e77ebd667a1d5e3b21