Bug 1755956 - Really fix rusttests on windows, by using utf-8 to read Cargo.toml in RunCbindgen.py so it doesn't choke on my name.

(And revert the previous commit).

MANUAL PUSH: Silly windows-only encoding fix CLOSED TREE

build/RunCbindgen.py

@@ -14,7 +14,7 @@ import pytoml
 # Try to read the package name or otherwise assume same name as the crate path.
 def _get_crate_name(crate_path):
     try:
-        with open(mozpath.join(crate_path, "Cargo.toml")) as f:
+        with open(mozpath.join(crate_path, "Cargo.toml"), encoding='utf-8') as f:
             return pytoml.load(f)["package"]["name"]
     except Exception:
         return mozpath.basename(crate_path)

dom/origin-trials/moz.build

@@ -14,7 +14,7 @@ if CONFIG["COMPILE_ENVIRONMENT"]:
 
     CbindgenHeader(
         "origin_trials_ffi_generated.h",
-        inputs=["/dom/origin-trials/ffi"],
+        inputs=["ffi"],
     )
 
 EXPORTS.mozilla += [