Back-patch creation of tar.bz2 tarball during "make dist".

Since commit a4d03bbcdaf7739d7e9073ee76bb186f68ddc163, "make dist" has
built both gzip- and bzip2-compressed tarballs.  However, this was
pretty useless, because our tarball build script didn't know about it
and proceeded to overwrite the bz2 file with new data.  Back-patch the
change to all active branches, so that creation of the tar.bz2 file
can be removed from the build script.

Branch
------
REL8_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/8de6e9472ff8bfdcecba8970771e51edb7564c70

Modified Files
--------------
GNUmakefile.in         |    8 +++++---
src/Makefile.global.in |    4 ++--
2 files changed, 7 insertions(+), 5 deletions(-)

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