Update (Windows) msvc extra_compile_args

Added Cython to see what compiler is used (on Windows)

Author: ahartikainen

setup.py

@@ -117,10 +117,12 @@ def find_version(*parts):
 ]
 
 if platform.platform().startswith('Win'):
-    extra_compile_args = [
-        '/EHsc',
-        '-DBOOST_DATE_TIME_NO_LIB',
-    ]
+    from Cython.Build.Inline import _get_build_extension
+    if _get_build_extension().compiler == 'msvc':
+        extra_compile_args = [
+            '/EHsc',
+            '-DBOOST_DATE_TIME_NO_LIB',
+        ]
 
 
 stanc_sources = [