posix/osx: fix type conflict on OSX native
posix/osx: fix type conflict on OSX native

In another header file, `socklen_t` is defined to `__darwin_socklen_t` which is
an `uint32_t` and it conflicts.

Preparation to remove NATIVEINCLUDES.

neiljay/RIOT,kYc0o/RIOT,biboc/RIOT,lazytech-org/RIOT,x3ro/RIOT,aeneby/RIOT,smlng/RIOT,BytesGalore/RIOT,yogo1212/RIOT,aeneby/RIOT,RIOT-OS/RIOT,basilfx/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,cladmi/RIOT,josephnoir/RIOT,avmelnikoff/RIOT,biboc/RIOT,mfrey/RIOT,OTAkeys/RIOT,BytesGalore/RIOT,rfuentess/RIOT,yogo1212/RIOT,OlegHahm/RIOT,josephnoir/RIOT,lazytech-org/RIOT,jasonatran/RIOT,OTAkeys/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,x3ro/RIOT,kaspar030/RIOT,A-Paul/RIOT,OTAkeys/RIOT,miri64/RIOT,mtausig/RIOT,BytesGalore/RIOT,gebart/RIOT,BytesGalore/RIOT,miri64/RIOT,avmelnikoff/RIOT,neiljay/RIOT,jasonatran/RIOT,kaspar030/RIOT,biboc/RIOT,mtausig/RIOT,jasonatran/RIOT,toonst/RIOT,kbumsik/RIOT,ant9000/RIOT,OTAkeys/RIOT,gebart/RIOT,kYc0o/RIOT,kbumsik/RIOT,mtausig/RIOT,basilfx/RIOT,kbumsik/RIOT,A-Paul/RIOT,smlng/RIOT,lazytech-org/RIOT,toonst/RIOT,toonst/RIOT,toonst/RIOT,cladmi/RIOT,RIOT-OS/RIOT,biboc/RIOT,smlng/RIOT,authmillenon/RIOT,OlegHahm/RIOT,BytesGalore/RIOT,gebart/RIOT,josephnoir/RIOT,mfrey/RIOT,OTAkeys/RIOT,authmillenon/RIOT,cladmi/RIOT,toonst/RIOT,josephnoir/RIOT,kYc0o/RIOT,aeneby/RIOT,yogo1212/RIOT,yogo1212/RIOT,avmelnikoff/RIOT,gebart/RIOT,cladmi/RIOT,yogo1212/RIOT,jasonatran/RIOT,neiljay/RIOT,avmelnikoff/RIOT,neiljay/RIOT,kaspar030/RIOT,miri64/RIOT,lazytech-org/RIOT,kYc0o/RIOT,rfuentess/RIOT,neiljay/RIOT,kYc0o/RIOT,kbumsik/RIOT,miri64/RIOT,mtausig/RIOT,basilfx/RIOT,miri64/RIOT,cladmi/RIOT,rfuentess/RIOT,kaspar030/RIOT,A-Paul/RIOT,authmillenon/RIOT,ant9000/RIOT,basilfx/RIOT,A-Paul/RIOT,biboc/RIOT,x3ro/RIOT,rfuentess/RIOT,rfuentess/RIOT,yogo1212/RIOT,ant9000/RIOT,x3ro/RIOT,jasonatran/RIOT,aeneby/RIOT,OlegHahm/RIOT,ant9000/RIOT,authmillenon/RIOT,avmelnikoff/RIOT,smlng/RIOT,mfrey/RIOT,x3ro/RIOT,smlng/RIOT,kbumsik/RIOT,mfrey/RIOT,kaspar030/RIOT,ant9000/RIOT,OlegHahm/RIOT,A-Paul/RIOT,aeneby/RIOT,gebart/RIOT,RIOT-OS/RIOT,lazytech-org/RIOT,mtausig/RIOT,josephnoir/RIOT,mfrey/RIOT,OlegHahm/RIOT,basilfx/RIOT