Added msvs_target_platform_version and msvs_target_platform_minversion for winrt compilation

pylib/gyp/generator/msvs.py

Index: pylib/gyp/generator/msvs.py
diff --git a/pylib/gyp/generator/msvs.py b/pylib/gyp/generator/msvs.py
index 1338790ef68f9cae0df435bd358452e8cb19edb8..4ce82ec8f43d7a6bc3347a4e8be02f23af275e23 100644
--- a/pylib/gyp/generator/msvs.py
+++ b/pylib/gyp/generator/msvs.py
@@ -87,6 +87,8 @@ generator_additional_non_configuration_keys = [
     'msvs_requires_importlibrary',
     'msvs_enable_winphone',
     'msvs_application_type_revision',
+    'msvs_target_platform_version',
+    'msvs_target_platform_minversion',
 ]
 
 
@@ -2644,6 +2646,14 @@ def _GetMSBuildGlobalProperties(spec, guid, gyp_file_name):
     else:
       properties[0].append(['ApplicationTypeRevision', '8.1'])
 
+    if spec.get('msvs_target_platform_version'):
+      tar_plat_ver = spec.get('msvs_target_platform_version')

[scottmg, 2015/08/12 04:12:20]

I don't like "tar" and "plat", "ver" is ok if it helps squish it in. (I know it
makes the append lines too long, but it's better to have a readable name.)

[coop, 2015/08/12 16:47:21]

YAY!  I am so glad you said this.  I originally had them as proper/clear names
but I thought you would bust me for exceeding the column line limits and I
changed it.  I will fix this back up.

+      properties[0].append(['WindowsTargetPlatformVersion', tar_plat_ver])
+      if spec.get('msvs_target_platform_minversion'):
+        tar_plat_mver = spec.get('msvs_target_platform_minversion')
+        properties[0].append(['WindowsTargetPlatformMinVersion', tar_plat_mver])
+      else:
+        properties[0].append(['WindowsTargetPlatformMinVersion', tar_plat_ver])
     if spec.get('msvs_enable_winphone'):
       properties[0].append(['ApplicationType', 'Windows Phone'])
     else: