Library install_name is wrong on macOS

[jmroot]

The install_name is set to just libSDL-1.2.0.dylib (should be either the full installation path, or relative to @something.) Removing this line from CMakeLists.txt seems to fix it:

set_target_properties(SDL PROPERTIES INSTALL_NAME_DIR "")

Not quite sure why that is being done in the first place, but maybe there's a good reason?

[icculus]

Not quite sure why that is being done in the first place, but maybe there's a good reason?

There might be, but I can't remember what at this point. I'll look into why (and possibly just remove the line).

[icculus]

Apparently I added this to shut off a cmake warning in 8743305, and @sezero noted it didn't help, so I'll just back it out.