Rename python3 folders to python

mingw-w64-python-matplotlib/setupext.py.patch

@@ -0,0 +1,28 @@
+--- matplotlib-3.1.0/setupext.py.orig	2019-05-18 03:55:28.000000000 +0200
++++ matplotlib-3.1.0/setupext.py	2019-05-19 11:31:01.633173900 +0200
+@@ -24,6 +24,7 @@
+ 
+ _log = logging.getLogger(__name__)
+ 
++MSYS = "MSYSTEM" in os.environ
+ 
+ def _get_xdg_cache_dir():
+     """
+@@ -220,7 +221,7 @@
+     def __init__(self):
+         """Determines whether pkg-config exists on this machine."""
+         self.pkg_config = None
+-        if sys.platform != 'win32':
++        if sys.platform != 'win32' or MSYS:
+             pkg_config = os.environ.get('PKG_CONFIG', 'pkg-config')
+             if shutil.which(pkg_config) is not None:
+                 self.pkg_config = pkg_config
+@@ -276,7 +277,7 @@
+ 
+         # conda Windows header and library paths.
+         # https://github.com/conda/conda/issues/2312 re: getting the env dir.
+-        if sys.platform == 'win32':
++        if sys.platform == 'win32' and not MSYS:
+             conda_env_path = (os.getenv('CONDA_PREFIX')  # conda >= 4.1
+                               or os.getenv('CONDA_DEFAULT_ENV'))  # conda < 4.1
+             if conda_env_path and os.path.isdir(conda_env_path):