VS2013 argument fix.

environment.py

@@ -853,17 +853,22 @@ class RustCompiler():
 class VisualStudioCCompiler(CCompiler):
     std_warn_args = ['/W3']
     std_opt_args= ['/O2']
-    always_args = ['/nologo', '/showIncludes']
+    vs2010_always_args = ['/nologo', '/showIncludes']
+    vs2013_always_args = ['/nologo', '/showIncludes', '/FS']
 
     def __init__(self, exelist, version, is_cross, exe_wrap):
         CCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
         self.id = 'msvc'
+        if int(version.split('.')[0]) > 17:
+            self.always_args = VisualStudioCCompiler.vs2013_always_args
+        else:
+            self.always_args = VisualStudioCCompiler.vs2010_always_args
 
     def get_always_args(self):
-        return VisualStudioCCompiler.always_args
+        return self.always_args
 
     def get_std_warn_args(self):
-        return VisualStudioCCompiler.std_warn_args
+        return self.std_warn_args
 
     def get_buildtype_args(self, buildtype):
         return msvc_buildtype_args[buildtype]