Use xenia-base entrypoint for test suites.

Use xenia-base entrypoint for test suites. Fixes a bug where we were expecting
wchar data in main, which is incorrect, causing invalid args to be parsed.

tools/build/scripts/test_suite.lua

@@ -26,8 +26,12 @@ local function combined_test_suite(test_suite_name, project_root, base_path, con
     }))
     links(merge_arrays(config["links"], {
     }))
+    defines({
+      "XE_TEST_SUITE_NAME=\""..test_suite_name.."\"",
+    })
     files({
       project_root.."/"..build_tools_src.."/test_suite_main.cc",
+      project_root.."/src/xenia/base/main_"..platform_suffix..".cc",
       base_path.."/**_test.cc",
     })
 end