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

[Kornel Benko]

commit 652835bdea60100d1a4653a1ae15a9e1520944cf
Author: Kornel Benko <kor...@lyx.org>
Date:   Tue Oct 21 14:50:44 2014 +0200

    Cmake build: Omit files with names not starting with aplha character.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 491e58f..075a6a7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -480,7 +480,7 @@ if(NOT GROUP_CODE)
 endif()
 
 # lyx's source files
-set(LYX_CPP_FILES *.cpp)
+set(LYX_CPP_FILES [a-zA-Z]*.cpp)
 set(LYX_HPP_FILES *.h)
 set(LYX_MOC_FILES moc_*.cpp)