Don't use ARC in the Obj-C++ code

It never allocated any non-autoreleased objects so ARC wasn't actually
doing anything other than breaking compilation with gcc.

aegisub/libaegisub/Makefile

@@ -44,7 +44,6 @@ SRC += \
 
 ifeq (yes, $(BUILD_DARWIN))
 SRC += osx/util.mm
-osx/util.o: OBJCXXFLAGS += -fobjc-arc
 endif
 
 HEADER += \

aegisub/libaegisub/osx/util.mm

@@ -84,7 +84,7 @@ std::string OSX_GetBundleAuxillaryExecutablePath(std::string const& executableNa
 void OSX_OpenLocation(std::string const& location) {
 	@autoreleasepool {
 		NSURL *url = [NSURL fileURLWithPath:[NSString stringWithUTF8String:location.c_str()]];
-		LSOpenCFURLRef((__bridge CFURLRef)url, NULL);
+		LSOpenCFURLRef((CFURLRef)url, NULL);
 	}
 }
 

aegisub/src/Makefile

@@ -20,7 +20,6 @@ LDFLAGS += $(LDFLAGS_CCMALLOC)
 
 ifeq (yes, $(BUILD_DARWIN))
 SRC += osx_utils.mm
-osx_utils.o: OBJCXXFLAGS += -fobjc-arc
 endif
 
 ###############

aegisub/src/osx_utils.mm

@@ -23,14 +23,6 @@
 
 #include "config.h"
 
-// This bit of awfulness is to disable some ARC-incompatible stuff in window.h
-// that we don't need
-#include <wx/brush.h>
-#undef wxOSX_USE_COCOA_OR_IPHONE
-#define wxOSX_USE_COCOA_OR_IPHONE 0
-class WXDLLIMPEXP_FWD_CORE wxWidgetImpl;
-typedef wxWidgetImpl wxOSXWidgetImpl;
-
 #include <wx/window.h>
 
 #import <AppKit/AppKit.h>
@@ -46,7 +38,7 @@ void AddFullScreenButton(wxWindow *window) {
 }
 
 void SetFloatOnParent(wxWindow *window) {
-    __unsafe_unretained NSWindow *nsWindow = [window->GetHandle() window];
+    __block NSWindow *nsWindow = [window->GetHandle() window];
     [nsWindow setLevel:NSFloatingWindowLevel];
 
     if (!([nsWindow collectionBehavior] & NSWindowCollectionBehaviorFullScreenPrimary))