ninja/win: Put common msvs_system_include_dirs into %INCLUDE%

test/win/system-include/test.gyp

Index: test/win/system-include/test.gyp
diff --git a/test/win/system-include/test.gyp b/test/win/system-include/test.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..a48976323742318ca073d5b7483b793229aa3675
--- /dev/null
+++ b/test/win/system-include/test.gyp
@@ -0,0 +1,26 @@
+{
+  'target_defaults': {
+    'msvs_settings': {
+      'VCCLCompilerTool': {
+        'WarningLevel': '4',
+        'WarnAsError': 'true',
+      },
+    },
+    'msvs_system_include_dirs': [
+      '$(ProjectName)',  # Different for each target
+      'common',  # Same for all targets

[scottmg, 2014/07/20 05:20:07]

This might need to be absolute? :/

[Nico, 2014/07/20 05:51:02]

Maybe, apparently. Passes for me locally as is :-/

+    ],
+  },
+  'targets': [
+    {
+      'target_name': 'foo',
+      'type': 'executable',
+      'sources': [ 'main.cc', ],
+    },
+    {
+      'target_name': 'bar',
+      'type': 'executable',
+      'sources': [ 'main.cc', ],
+    },
+  ],
+}