Do not include RPM spec files in tarball

This makes no sense. RPM needs the package specification as a separate
file, where the source tarballs are indicated. Chicken-and-egg...

Besides those files are out-of-date.
(cherry picked from commit ee3053e27485efc05856fd3574ab8daa65cfbd61)
Signed-off-by: David Fuhrmann <david.fuhrmann@googlemail.com>

Makefile.am

@@ -19,9 +19,6 @@ EXTRA_DIST = \
 	extras/package/win32/peflags.pl \
 	extras/package/win32/change-contribs-directory.sh \
 	extras/package/win32/configure.sh \
-	extras/package/rpm/vlc.suse.spec \
-	extras/package/rpm/vlc.fedora.spec \
-	extras/package/rpm/vlc.altlinux.spec \
 	extras/package/symbian/configure.sh \
 	extras/package/npapi.am \
 	extras/package/win32/vlc.win32.nsi.in \