Adjust ScmRevGen to match our use case better

Author: Motobug

CMake/ScmRevGen.cmake

@@ -7,10 +7,9 @@ if(GIT_FOUND)
       OUTPUT_VARIABLE DOLPHIN_WC_REVISION
       OUTPUT_STRIP_TRAILING_WHITESPACE)
   # defines DOLPHIN_WC_DESCRIBE
-  #execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} describe --always --long # --dirty # removed from here while we're using a patch for SDL; will likely be fixed in the future 
-  #    OUTPUT_VARIABLE DOLPHIN_WC_DESCRIBE
-  #    OUTPUT_STRIP_TRAILING_WHITESPACE)
-  			set(DOLPHIN_WC_DESCRIBE "v3.1.2-mainline-beta.5")
+  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} describe --tags # --always --long --dirty # removed from here while we're using a patch for SDL; will likely be fixed in the future 
+      OUTPUT_VARIABLE DOLPHIN_WC_DESCRIBE
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
 
   # remove hash (and trailing "-0" if needed) from description
   string(REGEX REPLACE "(-0)?-[^-]+((-dirty)?)$" "\\2" DOLPHIN_WC_DESCRIBE "${DOLPHIN_WC_DESCRIBE}")