Revert "mesa: fix make tarballs"

Revert "mesa: fix make tarballs"

This reverts commit 0fbb9a599df898d4e1166d6d6f00cb34a0524bea.

Rather than adding hacks around the issue drop the sources from the
final tarball, and re-add them back with 'make dist'. This fixes a
problem when running parallel 'make install' fails as it recreates
sources and triggers partial recompilation.

Cc: "10.2 10.3" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=83355
Reported-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Tested-by: Kai Wasserbäch <kai@dev.carbon-project.org>