Fix issue where MSYS2 and MinGW mistaken for Linux (#628)
When running `emsdk.py` with python provided by MSYS2/MinGW the environment gets falsely identified as Linux.
See discussion for details:
https://github.com/emscripten-core/emscripten/issues/12376#issuecomment-702245993
Fixes #385
diff --git a/emsdk.py b/emsdk.py
index 5e38497..eb2686c 100644
--- a/emsdk.py
+++ b/emsdk.py
@@ -74,7 +74,7 @@
MACOS = True
LINUX = False
-if not MACOS and (platform.system() == 'Linux' or os.name == 'posix'):
+if not MACOS and (platform.system() == 'Linux'):
LINUX = True
UNIX = (MACOS or LINUX)