2.12.3 source tarball changed (back in january)

[Matthias Kilian]

Hi,

a fellow openbsd developer noticed that the 2.12.3 source tarball
(http://download.linuxaudio.org/lilypond/sources/v2.12/lilypond-2.12.3.tar.gz)
differs from the same version from late december (december, 20th,
I think).

Please avoid such changes in the future, they make the live of
port/packages maintainers very hard, because checksums are changing,
mirrors of the source tarballs have to be noticed etc.

Ciao,
        Kili