Add socklen_t typedef for very old systems that don't provide it.

git-svn-id: svn://svn.code.sf.net/p/bitchx/code/trunk@286 13b04d17-f746-0410-82c6-800466cd88b0

include/irc_std.h

@@ -136,6 +136,10 @@ char *alloca();
 extern	int	errno;
 #endif
 
+#ifndef HAVE_SOCKLEN_T
+typedef int socklen_t;
+#endif
+
 #ifndef NBBY
 # define NBBY		8			/* number of bits in a byte */
 #endif /* NBBY */