Add _UNICODE to default defines on Windows (#1540)

* Add _UNICODE to default defines on Windows
Fixes #1538

Author: sylveon

Extension/CHANGELOG.md

@@ -9,6 +9,7 @@
 * Fix error popup appearing with non-workspace files when using `compile_commands.json`. [#1475](https://github.com/Microsoft/vscode-cpptools/issues/1475)
 * Add more macros to `cpp.hint` (fixing missing symbols).
 * Added support for config variables to `c_cpp_properties.json` [#314](https://github.com/Microsoft/vscode-cpptools/issues/314)
+* Define `_UNICODE` by default on Windows platforms. [#1538](https://github.com/Microsoft/vscode-cpptools/issues/1538)
 
 ## Version 0.14.6: January 17, 2018
 * Fix tag parser failing (and continuing to fail after edits) when it shouldn't. [#1367](https://github.com/Microsoft/vscode-cpptools/issues/1367)

Extension/src/LanguageServer/configurations.ts

@@ -63,7 +63,8 @@ let defaultSettings: string = `{
             ],
             "defines": [
                 "_DEBUG",
-                "UNICODE"
+                "UNICODE",
+                "_UNICODE"
             ],
             "intelliSenseMode": "msvc-x64",
             "browse": {