make error on mac

[kyly1982]

1.mcpelauncher-linux/src/ui/file_picker/file_picker_zenity.cpp need include errno.h
2.make generate an error

clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [server] Error 1
make[1]: *** [CMakeFiles/server.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
2 warnings generated.
[ 28%] Linking CXX executable mcpelauncher
[ 67%] Built target mcpelauncher
make: *** [all] Error 2

OS:macOS High Sierra
Xcode: Xcode 9.4.1