[x265] [PATCH] cmake: Use alternate method to get latest tag

[Ricardo Constantino]

# HG changeset patch
# User Ricardo Constantino <wiiaboo at gmail.com>
# Date 1465938156 -3600
#      Tue Jun 14 22:02:36 2016 +0100
# Node ID 6542b46daff8a06f5cae42a47ca894bbee7b37ac
# Parent  106a5a7dc4b337121c11484bc3bc4900b8a0d9a4
cmake: Use alternate method to get latest tag

--first-parent only works with git describe since git v1.8.4

diff -r 106a5a7dc4b3 -r 6542b46daff8 source/cmake/version.cmake
--- a/source/cmake/version.cmake	Thu Jun 09 13:34:55 2016 -0500
+++ b/source/cmake/version.cmake	Tue Jun 14 22:02:36 2016 +0100
@@ -66,7 +66,15 @@
 elseif(GIT_EXECUTABLE AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/../.git)
     execute_process(
         COMMAND
-        ${GIT_EXECUTABLE} describe --tags --abbrev=0 --first-parent
+        ${GIT_EXECUTABLE} rev-list --tags --max-count=1
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        OUTPUT_VARIABLE X265_LATEST_TAG_COMMIT
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        )
+    execute_process(
+        COMMAND
+        ${GIT_EXECUTABLE} describe --tags ${X265_LATEST_TAG_COMMIT}
         WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
         OUTPUT_VARIABLE X265_LATEST_TAG
         ERROR_QUIET