Travis: Fixed git version info output

(cherry picked from commit 03917c79cdecb906912d9a94ac5ccdaecc8f62e1)

cmake/genrev.cmake

@@ -24,7 +24,7 @@ else()
   if(GIT_EXECUTABLE)
     # Create a revision-string that we can use
     execute_process(
-      COMMAND "${GIT_EXECUTABLE}" describe --match init --dirty=+ --abbrev=12
+      COMMAND "${GIT_EXECUTABLE}" describe --long --match init --dirty=+ --abbrev=12
       WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
       OUTPUT_VARIABLE rev_info
       OUTPUT_STRIP_TRAILING_WHITESPACE