cmake: When replacing old tags, use origin.

Fetch new set of tags from the origin remote explicitly rather than
whatever remote is associated with the current branch.

In this way, old tags on other remotes get overwritten as well.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

CMakeLists.txt

@@ -280,7 +280,7 @@ if(GIT_FOUND AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
         endforeach()
 
         execute_process(
-            COMMAND ${GIT_EXECUTABLE} fetch --tags
+            COMMAND ${GIT_EXECUTABLE} fetch --tags origin
             OUTPUT_QUIET
             ERROR_QUIET
             WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}