Make VSA_Get_Sockaddr() return a const void*, since we don't know

what sockaddr-hack it is destined for.

include/vsa.h

@@ -38,7 +38,7 @@ unsigned VSA_Port(const struct suckaddr *);
 int VSA_Compare(const struct suckaddr *, const struct suckaddr *);
 struct suckaddr *VSA_Clone(const struct suckaddr *sua);
 
-const struct sockaddr *VSA_Get_Sockaddr(const struct suckaddr *, socklen_t *sl);
+const void *VSA_Get_Sockaddr(const struct suckaddr *, socklen_t *sl);
 int VSA_Get_Proto(const struct suckaddr *);
 
 /*

lib/libvarnish/vsa.c

@@ -265,7 +265,7 @@ VSA_Build(void *d, const void *s, unsigned sal)
 	return (NULL);
 }
 
-const struct sockaddr *
+const void *
 VSA_Get_Sockaddr(const struct suckaddr *sua, socklen_t *sl)
 {