compiling CLI version on ARM

[jemcek]

compiling CLI version on ARM platforms fails:

/tmp/ccR7C9OY.s: Assembler messages:
/tmp/ccR7C9OY.s:1126: Error: unknown mnemonic movl' -- movl (x0),x2'
/tmp/ccR7C9OY.s:1127: Error: unknown mnemonic subl' -- subl $4,x1'
...

this is because the the function ip_fast_csum() has some assembler code.

This function is only used in IDS testing mode, so temporarily, just delete everything inside this function and it will probably compile.

[jemcek]

this diff could be used instead, need to check

564,592d563
< 	unsigned short *addr = (unsigned short*)iph;
< 	register int sum = 0;
< 	u_short answer = 0;
< 	register u_short *w = addr;
< 	register int nleft = ihl;//len;
< 
< 	/*
< 	 *          * Our algorithm is simple, using a 32 bit accumulator (sum), we add
< 	 *          * sequential 16 bit words to it, and at the end, fold back all the
< 	 *          * carry bits from the top 16 bits into the lower 16 bits.
< 	 *          */
< 	while (nleft > 1)  {
< 		sum += *w++;
< 	        nleft -= 2;
< 	}
< 
< 	/* mop up an odd byte, if necessary */
< 	if (nleft == 1) {
< 		*(u_char *)(&answer) = *(u_char *)w ;
< 		sum += answer;
< 	}
< 
< 	/* add back carry outs from top 16 bits to low 16 bits */
< 	sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
< 	sum += (sum >> 16);                     /* add carry */
< 	answer = ~sum;                          /* truncate to 16 bits */
< 	return(answer);
< 	
< 	/*
611c582
< 	    "2:"*/
---
> 	    "2:"
615c586
< 	/*    : "=r" (sum), "=r" (iph), "=r" (ihl)
---
> 	    : "=r" (sum), "=r" (iph), "=r" (ihl)
618c589
< 	return (__sum16)sum;*/
---
> 	return (__sum16)sum;