Overwrite symlinks for config files

In Makefile, we are trying to remove old symlinks first and then create a symlink.
do the same thing in meson too.

Also, the line of the exception handling for FileExistsError is meaningless
as the above line is taking care of it instead and we shouldn't ignore it if
os.remove and os.symlink doesn't work somehow.

Fixes https://gitlab.freedesktop.org/fontconfig/fontconfig/-/issues/275

conf.d/link_confs.py

@@ -20,6 +20,10 @@ if __name__=='__main__':
     for link in args.links:
         src = os.path.join(args.availpath, link)
         dst = os.path.join(confpath, link)
+        try:
+            os.remove(dst)
+        except FileNotFoundError:
+            pass
         try:
             os.symlink(src, dst)
         except NotImplementedError:
@@ -30,5 +34,3 @@ if __name__=='__main__':
             if platform.system().lower() == 'windows' and e.winerror == 1314:
                 break
             raise
-        except FileExistsError:
-            pass