[LyX/master] Cmake build: Omit files with names not starting with aplha character.

[Stephan Witt]

commit 652835bdea60100d1a4653a1ae15a9e1520944cf
Date: Tue Oct 21 14:50:44 2014 +0200
Cmake build: Omit files with names not starting with aplha character.

Ok, thanks. It works.

Stephan