selinux: really fix dependency causing parallel compile failure.

While the previous change to the selinux Makefile reduced the window
significantly for this failure, it is still possible to see a compile
failure where cpp starts processing selinux files before the auto
generated flask.h file is completed.  This is easily reproduced by
adding the following temporary change to expose the issue everytime:

-      cmd_flask = scripts/selinux/genheaders/genheaders ...
+      cmd_flask = sleep 30 ; scripts/selinux/genheaders/genheaders ...

This failure happens because the creation of the object files in the ss
subdir also depends on flask.h.  So simply incorporate them into the
parent Makefile, as the ss/Makefile really doesn't do anything unique.

With this change, compiling of all selinux files is dependent on
completion of the header file generation, and this test case with
the "sleep 30" now confirms it is functioning as expected.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: James Morris <jmorris@namei.org>

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