Remove OS check in RCTMultiPartDataTask.m #1600
Description
We're well past a minimum iOS version of 9 / macOS version of 10.11. This can be cleaned up.
static BOOL isStreamTaskSupported() {
#if !TARGET_OS_OSX // [macOS]
return [[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){9,0,0}];
#else // [macOS
return [[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){10,11,0}];
#endif // macOS]
}