Fixed tst_qlogging app silently not compiled in some -fast builds.

Fixed tst_qlogging app silently not compiled in some -fast builds.

When configuring with -fast on Windows, a directory which contains two
.pro files, one SUBDIRS and one not, will have the SUBDIRS Makefile
silently clobbered by the non-SUBDIRS Makefile.  In practice, this may
cause various subdirectories to be silently excluded from the build.

Rearrange .pro files for this test to avoid triggering this bug.

Task-number: QTBUG-21168
Change-Id: Ic51941db497d7b8fb004f3c50f5ea24d90ff3114
Reviewed-by: Toby Tomkins <toby.tomkins@nokia.com>