[LyX/master] Cmake export tests: Allow also '_' char as part of ctest-label

[Kornel Benko]

commit 454b83694ac95b6021d12fb266c9f6d3d76e3c70
Author: Kornel Benko <kor...@lyx.org>
Date:   Sat Mar 26 13:16:46 2016 +0100

    Cmake export tests: Allow also '_' char as part of ctest-label
    
    Missed in previous commit

diff --git a/development/autotests/ExportTests.cmake 
b/development/autotests/ExportTests.cmake
index e4a65de..f448d80 100644
--- a/development/autotests/ExportTests.cmake
+++ b/development/autotests/ExportTests.cmake
@@ -39,7 +39,7 @@ endif()
 set(potential_languages "ca" "cs" "da" "de" "el" "es" "eu" "fa" "fr" "gl" "he" 
"hu" "id" "it" "ja" "ko" "nb" "nl" "pl" "pt" "ro" "ru" "sk" "sl" "sr" "sv" "uk" 
"zh_CN")
 
 # Used to select labels from .*Tests files
-set(label_chars "[a-zA-Z:]+")
+set(label_chars "[a-zA-Z:_]+")
 
 macro(initLangVars varname)
   foreach(_l ${potential_languages})