[Base] Changed entry point to wmain for Windows

This prevents subapps from crashing when executing wmain specific functions

src/xenia/base/console_app_main_win.cc

@@ -13,7 +13,8 @@
 #include "xenia/base/console_app_main.h"
 #include "xenia/base/main_win.h"
 
-int main(int argc_ignored, char** argv_ignored) {
+// A wide character entry point is required for functions like _get_wpgmptr.
+int wmain(int argc_ignored, wchar_t** argv_ignored) {
   xe::ConsoleAppEntryInfo entry_info = xe::GetConsoleAppEntryInfo();
 
   std::vector<std::string> args;

src/xenia/base/console_win.cc

@@ -27,7 +27,7 @@ static bool has_shell_environment_variable() {
   size_t size = 0;
   // Check if SHELL exists
   // If it doesn't, then we are in a Windows Terminal
-  auto error = getenv_s(&size, nullptr, 0, "SHELL");
+  auto error = _wgetenv_s(&size, nullptr, 0, L"SHELL");
   if (error) {
     return false;
   }