[LyX/master] Cmake: ENCODING parameter in file(STRINGS ...) only valid for cmake version >= 3.1

[Kornel Benko]

commit 21c265addb7bce6ba8e4dd59100f1c3bd5bda5c5
Author: Kornel Benko <kor...@lyx.org>
Date:   Thu Nov 26 12:08:13 2015 +0100

    Cmake: ENCODING parameter in file(STRINGS ...) only valid for cmake version 
>= 3.1

diff --git a/development/autotests/ExportTests.cmake 
b/development/autotests/ExportTests.cmake
index 98ef8fa..6beee79 100644
--- a/development/autotests/ExportTests.cmake
+++ b/development/autotests/ExportTests.cmake
@@ -150,7 +150,12 @@ set(known_labels "export" "key" "layout" "load" "lyx2lyx"
 
 macro(loadTestList filename resList)
   # Create list of strings from a file without comments
-  file(STRINGS ${filename} tempList ENCODING "UTF-8")
+  # ENCODING parameter is a new feature in cmake 3.1
+  if (CMAKE_VERSION VERSION_GREATER "3.1")
+    file(STRINGS ${filename} tempList ENCODING "UTF-8")
+  else()
+    file(STRINGS ${filename} tempList)
+  endif()
   set(${resList})
   set(sublabel)
   set(mylabels "")