IAX: fix warnings

(cherry picked from commit fd7a113a)

sflphone-common/libs/iax2/iax-client.h

@@ -19,7 +19,7 @@
 #pragma warning(disable:4200)
 #endif
 
-#ifndef LINUX
+#ifndef __linux__
 #define socklen_t int
 #endif
 

sflphone-common/libs/iax2/iax.c

@@ -878,7 +878,6 @@ int iax_init(int preferredportno)
 	{
 		struct sockaddr_in sin;
 		socklen_t sinlen;
-		socklen_t *slen = &sinlen;
 		int flags;
 		int bufsize = 256 * 1024;
 
@@ -929,7 +928,7 @@ int iax_init(int preferredportno)
 		}
 
 		sinlen = sizeof(sin);
-		if (getsockname(netfd, (struct sockaddr *) &sin, slen) < 0)
+		if (getsockname(netfd, (struct sockaddr *) &sin, &sinlen) < 0)
 		{
 			close(netfd);
 			netfd = -1;

sflphone-common/libs/iax2/md5.c

@@ -3,7 +3,7 @@
 
 #ifdef FREEBSD
 # include <machine/endian.h>
-#elif defined(LINUX)  
+#elif defined(__linux__)
 # include <endian.h>
 # include <features.h>
 # include <sys/types.h>