Rename some constants for cross-platform compat
Rename some constants for cross-platform compat

PSPDFKit-labs/libdispatch,SproutOrc/libdispatch,SproutOrc/libdispatch,evaautomation/libdispatch,PSPDFKit-labs/libdispatch,PSPDFKit-labs/libdispatch,SproutOrc/libdispatch,nickhutchinson/libdispatch,evaautomation/libdispatch,nickhutchinson/libdispatch,evaautomation/libdispatch,nickhutchinson/libdispatch,nickhutchinson/libdispatch,PSPDFKit-labs/libdispatch,SproutOrc/libdispatch,evaautomation/libdispatch