[Base] Change behavior of has_console_attached().

[Base] Change has_console_attached() so that it no longer proves true
if Xenia is launched from a Windows Terminal.

src/xenia/base/main_win.cc

@@ -38,11 +38,29 @@ bool has_console_attached_ = true;
 
 bool has_console_attached() { return has_console_attached_; }
 
+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");
+  if (error) {
+    return false;
+  }
+  return !!size;
+}
+
 void AttachConsole() {
   if (!cvars::enable_console) {
     return;
   }
 
+  bool has_console = ::AttachConsole(ATTACH_PARENT_PROCESS) == TRUE;
+  if (!has_console || !has_shell_environment_variable()) {
+    // We weren't launched from a console, so just return.
+    has_console_attached_ = false;
+    return;
+  }
+
   AllocConsole();
 
   has_console_attached_ = true;