Fix typo.

cmake-modules/AddGTest.cmake

@@ -13,7 +13,7 @@ if (MSVC)
 elseif(XCODE_VERSION)
   set(RELEASE_LIB_DIR Release)
   set(DEBUG_LIB_DIR Debug)
-else()else()
+else()
   set(RELEASE_LIB_DIR "")
   set(DEBUG_LIB_DIR "")
 endif()