apprt/embedded: compile for Linux

include/ghostty.h

@@ -30,6 +30,10 @@ typedef void *ghostty_surface_t;
 typedef void *ghostty_inspector_t;
 
 // Enums are up top so we can reference them later.
+typedef enum {
+    GHOSTTY_PLATFORM_MACOS,
+} ghostty_platform_e;
+
 typedef enum {
     GHOSTTY_CLIPBOARD_STANDARD,
     GHOSTTY_CLIPBOARD_SELECTION,