slirp: Fix bit field types in IP header structs

-mms-bitfields prevents that the bitfields in current IP header structs
are packed into a single byte as it is required. Fix this by using
uint8_t as backing type.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>

slirp/ip.h

@@ -74,10 +74,10 @@ typedef uint32_t n_long;                 /* long as received from the net */
  */
 struct ip {
 #ifdef HOST_WORDS_BIGENDIAN
-	u_int ip_v:4,			/* version */
+	uint8_t ip_v:4,			/* version */
 		ip_hl:4;		/* header length */
 #else
-	u_int ip_hl:4,		/* header length */
+	uint8_t ip_hl:4,		/* header length */
 		ip_v:4;			/* version */
 #endif
 	uint8_t		ip_tos;			/* type of service */
@@ -140,10 +140,10 @@ struct	ip_timestamp {
 	uint8_t	ipt_len;		/* size of structure (variable) */
 	uint8_t	ipt_ptr;		/* index of current entry */
 #ifdef HOST_WORDS_BIGENDIAN
-	u_int	ipt_oflw:4,		/* overflow counter */
+	uint8_t	ipt_oflw:4,		/* overflow counter */
 		ipt_flg:4;		/* flags, see below */
 #else
-	u_int	ipt_flg:4,		/* flags, see below */
+	uint8_t	ipt_flg:4,		/* flags, see below */
 		ipt_oflw:4;		/* overflow counter */
 #endif
 	union ipt_timestamp {

slirp/tcp.h

@@ -51,10 +51,10 @@ struct tcphdr {
 	tcp_seq	th_seq;			/* sequence number */
 	tcp_seq	th_ack;			/* acknowledgement number */
 #ifdef HOST_WORDS_BIGENDIAN
-	u_int	th_off:4,		/* data offset */
+	uint8_t	th_off:4,		/* data offset */
 		th_x2:4;		/* (unused) */
 #else
-	u_int	th_x2:4,		/* (unused) */
+	uint8_t	th_x2:4,		/* (unused) */
 		th_off:4;		/* data offset */
 #endif
 	uint8_t th_flags;