servo: Merge #13112 - stylo: Fix incorrect flag syntax in regen.py (from bholley:regenpy_fix); r=emilio

Source-Repo: https://github.com/servo/servo
Source-Revision: a338beaa7012f1cbfeebe559e58d1f0186c2cdee

servo/ports/geckolib/binding_tools/regen.py

@@ -321,7 +321,7 @@ def build(objdir, target_name, debug, debugger, kind_name=None,
             flags.append("{}Strong".format(ty))
             flags.append("--raw-line")
             flags.append("pub type {0}Strong = ::sugar::refptr::Strong<{0}>;".format(ty))
-            flags.append("-blacklist-type")
+            flags.append("--blacklist-type")
             flags.append("{}Borrowed".format(ty))
             flags.append("--raw-line")
             flags.append("pub type {0}Borrowed<'a> = ::sugar::refptr::Borrowed<'a, {0}>;".format(ty))