configure_file: Compare difference in binary mode

Otherwise Python will try to use string decode on the configured file
and fail if it contains characters that can't be mapped to the current
encoding.

mesonbuild/mesonlib.py

@@ -534,7 +534,7 @@ def replace_if_different(dst, dst_tmp):
     # unnecessary rebuilds.
     different = True
     try:
-        with open(dst, 'r') as f1, open(dst_tmp, 'r') as f2:
+        with open(dst, 'rb') as f1, open(dst_tmp, 'rb') as f2:
             if f1.read() == f2.read():
                 different = False
     except FileNotFoundError: