Add the CMake directory created during unit testing to .gitignore.

Change-Id: I58081e5dcea9e4a154de11ea897f0ba9f7399f3f
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>

.gitignore

@@ -126,6 +126,7 @@ tst_*
 tst_*.log
 tst_*.debug
 tst_*~
+tests/auto/cmake/build
 
 # xemacs temporary files
 *.flc