Look for 'freebsd' in sys.platform

--HG--
branch : Debian patch for GNU/kFreeBSD

scapy/arch/__init__.py

@@ -45,8 +45,8 @@ def get_if_hwaddr(iff):
 
 LINUX=sys.platform.startswith("linux")
 OPENBSD=sys.platform.startswith("openbsd")
-FREEBSD=sys.platform.startswith("freebsd")
-NETBSD = sys.platform.startswith("netbsd")
+FREEBSD= "freebsd" in sys.platform
+NETBSD=sys.platform.startswith("netbsd")
 DARWIN=sys.platform.startswith("darwin")
 SOLARIS=sys.platform.startswith("sunos")
 WINDOWS=sys.platform.startswith("win32")