Reorder preprocessor conditions in libi2pd/I2PEndian.h
Reorder preprocessor conditions in libi2pd/I2PEndian.h

The problem is that __FreeBSD_kernel__ may be defined on FreeBSD as
well, while it always needs <sys/endian.h>

hypnosis-i2p/i2pd,brain5lug/i2pd,brain5lug/i2pd,hypnosis-i2p/i2pd,brain5lug/i2pd,majestrate/i2pd,majestrate/i2pd,majestrate/i2pd,hypnosis-i2p/i2pd,PurpleI2P/i2pd,brain5lug/i2pd,hypnosis-i2p/i2pd,PurpleI2P/i2pd,majestrate/i2pd,majestrate/i2pd,hypnosis-i2p/i2pd,PurpleI2P/i2pd,PurpleI2P/i2pd