Cater for different drive letters when normalizing path

foreign_cc/private/framework.bzl

@@ -661,11 +661,9 @@ def _print_env():
     ]
 
 def _normalize_path(path):
-    # Change Windows style paths to Unix style. E.g. change "C:" to "/c"
-    if path[0].isalpha() and path[1] == ":":
-        path = path.replace(path[0:2], "/" + path[0].lower())
-
-    return path.replace("\\", "/").replace(";", ":")
+    # Change Windows style paths to Unix style. E.g. change "C:" to "/C"
+    # Also try to account for varying drive letters in the path
+    return "/" + path.replace("\\", "/").replace(":/", "/").replace(";", ":/")
 
 def _correct_path_variable(env):
     value = env.get("PATH", "")