Merge remote-tracking branch 'tor-github/pr/1329'

changes/ticket31336

+  o Minor bugfixes (developer tools):
+    - Allow paths starting with ./ in scripts/add_c_file.py. Fixes bug 
+      31336; bugfix on 0.4.1.2-alpha.

scripts/maint/add_c_file.py

@@ -15,9 +15,7 @@ import time
 
 def topdir_file(name):
     """Strip opening "src" from a filename"""
-    if name.startswith("src/"):
-        name = name[4:]
-    return name
+    return os.path.relpath(name, './src')
 
 def guard_macro(name):
     """Return the guard macro that should be used for the header file 'name'.