[teagba] Make TeaGBA (other than the ARM asm) build on all platforms

deps/teagba/src/bios_stub.cpp

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2016 - 2023 gary@drinkingtea.net
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// stubs for building TeaGBA for PC targets, for purposes of not having to
+// switch back and forth between builds when editing GBA files
+
+extern "C" {
+
+void teagba_halt() {}
+
+void teagba_stop() {}
+
+void teagba_intrwait(unsigned, unsigned) {}
+
+void teagba_vblankintrwait() {}
+
+}