Fix typo

Author: hoodmane

Platforms/emscripten/__main__.py

@@ -79,7 +79,7 @@ def get_build_paths(cross_build_dir=None, emsdk_cache=None):
 
 def validate_emsdk_version(emsdk_cache):
     """Validate that the emsdk cache contains the required emscripten version."""
-    if emsdk_cahce is None:
+    if emsdk_cache is None:
         return
     required_version = required_emscripten_version()
     emsdk_env = emsdk_activate_path(emsdk_cache)