More Windows->Unix style path fixes. (#25119)

lib/python/qmk/commands.py

@@ -12,6 +12,7 @@ from qmk.constants import QMK_USERSPACE, HAS_QMK_USERSPACE
 from qmk.json_schema import json_load, validate
 from qmk.keyboard import keyboard_alias_definitions
 from qmk.util import maybe_exit
+from qmk.path import unix_style_path
 
 
 def find_make():
@@ -85,7 +86,7 @@ def build_environment(args):
     envs = parse_env_vars(args)
 
     if HAS_QMK_USERSPACE:
-        envs['QMK_USERSPACE'] = Path(QMK_USERSPACE).resolve()
+        envs['QMK_USERSPACE'] = unix_style_path(Path(QMK_USERSPACE).resolve())
 
     return envs