- For some reason __MAC_10_6 is defined in the 10.5 SDK so use MAC_OS_X_VERSION_MAX to check SDK version instead.
- Ignore unknown properties in the GAMEINFO lump instead of throwing an error.
Merge branch 'origin/maint'
Treat packets from unknown nodes differently

Instead of trying to decompress packets from unknown connections (and
failing them anyway), they are now reported and discarded without doing
anything else.
Merge branch 'master' of https://github.com/Edward850/zdoom
- removed all unneeded files from gdtoa/CMakeLists.txt because some compilers seem to throw duplicate symbol errors when strtod gets included.