Remove unused include

The endian.h header is not used for anything and was earlier
added by mistake. It however hampers building on some systems
where it doesn't exist.

Resolves ipmitool/ipmitool#101
Signed-off-by: Alexander Amelkin <alexander@amelkin.msk.ru>

lib/ipmi_mc.c

@@ -36,7 +36,6 @@
 #include <time.h>
 #include <limits.h>
 #include <stdbool.h>
-#include <endian.h>
 
 #include <arpa/inet.h>