Add new search path for utf8_range in CMake build

This will allow us to run the CMake test from within the protobuf repo's Bazel
workspace. The directory structure is a little bit different depending on which
workspace the test is invoked in.

PiperOrigin-RevId: 557275295

cmake/make_cmakelists.py

@@ -366,6 +366,8 @@ class Converter(object):
       if(EXISTS ../external/utf8_range)
         # utf8_range is already installed
         include_directories(../external/utf8_range)
+      elseif(EXISTS ../../utf8_range)
+        include_directories(../../utf8_range)
       else()
         include(FetchContent)
         FetchContent_Declare(