Revert RGSSAD changes

I intend to rewrite a lot of the filesystem code someday --
actually I intended to start when I made this change --
but it turned out that I do not have as much time as I think I do.

src/filesystem.mm

@@ -28,7 +28,7 @@
 #import "eventthread.h"
 #import "exception.h"
 #import "font.h"
-//#import "rgssad.h"
+#import "rgssad.h"
 #import "sharedstate.h"
 #import "util.h"
 
@@ -295,7 +295,7 @@ FileSystem::FileSystem(const char *argv0, bool allowSymlinks) {
     throwPhysfsError("Error initializing PhysFS");
 
   /* One error (=return 0) turns the whole product to 0 */
-/*
+
   int er = 1;
 
   er *= PHYSFS_registerArchiver(&RGSS1_Archiver);
@@ -304,7 +304,7 @@ FileSystem::FileSystem(const char *argv0, bool allowSymlinks) {
 
   if (er == 0)
     throwPhysfsError("Error registering PhysFS RGSS archiver");
-*/
+
   p = new FileSystemPrivate;
   p->havePathCache = false;
 

src/meson.build

@@ -107,7 +107,8 @@ main_source = files(
     'autotilesvx.cpp',
     'midisource.cpp',
     'fluid-fun.cpp',
-    'lang-fun.mm'
+    'lang-fun.mm',
+    'rgssad.cpp'
 )
 
 if get_option('easypoke') == true and miniffi == true