net/hostapd: Fix build on DragonFly and with LibreSSL

1. Return the driver_bsd.c patch, it's still required for DF
2. Modify the os_unix.c patch to include exception for DF
3. Add patch to fix build with LibreSSL (originates from OpenBSD)
4. There's no configure set, so replace ineffective configure arg with CFLAGS and LDFLAGS for non-base SSL library

Approved by: SSL blanket and DF blanket