python3-matplotlib: Update to 3.1.0

mingw-w64-python3-matplotlib/setupext.py.patch

@@ -1,37 +1,28 @@
---- matplotlib-3.0.0/setupext.py.orig	2018-09-18 05:17:52.000000000 +0200
-+++ matplotlib-3.0.0/setupext.py	2018-09-20 12:51:06.529116400 +0200
-@@ -22,6 +22,7 @@
- import setuptools
- import versioneer
+--- 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():
      """
-@@ -267,7 +268,7 @@
-         """
-         Determines whether pkg-config exists on this machine.
-         """
+@@ -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:
-             self.has_pkgconfig = False
-         else:
-             self.pkg_config = os.environ.get('PKG_CONFIG', 'pkg-config')
-@@ -946,7 +947,7 @@
-         if options.get('local_freetype'):
-             return "Using local version for testing"
- 
--        if sys.platform == 'win32':
-+        if sys.platform == 'win32' and not MSYS:
-             try:
-                 check_include_file(get_include_dirs(), 'ft2build.h', 'freetype')
-             except CheckFailed:
-@@ -1176,7 +1177,7 @@
-         }
- 
-     def check(self):
--        if sys.platform == 'win32':
-+        if sys.platform == 'win32' and not MSYS:
-             check_include_file(get_include_dirs(), 'png.h', 'png')
-             return 'Using unknown version found on system.'
- 
+             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):