build: Don't remove adu.png on make clean.
authorAndre Noll <maan@tuebingen.mpg.de>
Mon, 6 Jun 2016 06:46:09 +0000 (08:46 +0200)
committerAndre Noll <maan@tuebingen.mpg.de>
Mon, 6 Jun 2016 06:46:09 +0000 (08:46 +0200)
commit1e5a1cb342d8cba5c55a720eaca1f095d516ba51
treefb55247ccb88d9e75f1845fdc6768608b80aa9d0
parent2c6a364ea289f39581d1915df6c0bfa01f98b5c1
build: Don't remove adu.png on make clean.

This was appropriate with the old logo which was generated from a
.sk source file. The new logo, however, only exists in png format,
so we should never remove it.

The adu.sk~ file can also be skipped from the list of files to be
removed by make clean.
Makefile