Use resolv library in Solaris

For some Solaris flavours, the inet_aton in in resolv library.
Not linking this library will introduce link error.

Improves compatability with older Solaris and still
works on new Solaris.

Closes #1092

src/Makefile

@@ -58,7 +58,7 @@ ifeq ($(uname_S),SunOS)
 	# SunOS
 	INSTALL=cp -pf
 	FINAL_CFLAGS+= -D__EXTENSIONS__ -D_XPG6
-	FINAL_LIBS+= -ldl -lnsl -lsocket -lpthread
+	FINAL_LIBS+= -ldl -lnsl -lsocket -lresolv -lpthread
 else
 ifeq ($(uname_S),Darwin)
 	# Darwin (nothing to do)