correction to successfully build for FreeBSD

[airflow2010]

In my recent tests, I found two small corrections which had to be done to successfully build for FreeBSD:

/usr/bin/sed -i -- 's/-Werror//g' Makefile
/usr/bin/sed -i -- '1320s/$/ && !defined(PLATFORM_FREEBSD)/' Os/Posix/Os.c

[airflow2010]

Additional comment: My changes are referring to version 1.30.3937. The second line specifically is targeted to the "isWireless"-function, which has to be disabled for FreeBSD.