Fix https://bugzilla.libsdl.org/show_bug.cgi?id=5306
(Also see: https://bugzilla.libsdl.org/show_bug.cgi?id=4822)
Building the current tree against 10.8 SDK, clang emits the following warning:
src/video/cocoa/SDL_cocoawindow.m:1846:27: warning: instance method '-isOperatingSystemAtLeastVersion:' not found (return type defaults to 'id') [-Wobjc-method-access]
![processInfo isOperatingSystemAtLeastVersion:version]) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/MacOSX10.8.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSProcessInfo.h:20:12: note: receiver is instance of class declared here
@interface NSProcessInfo : NSObject {
^
1 warning generated.
isOperatingSystemAtLeastVersion is an 10.10 thing.
1 file changed
