Fix bug # 4357 where FTP is broken on the Mac. This is basically the same bug...

Fix bug # 4357 where FTP is broken on the Mac. This is basically the same bug and same bug fix as bug # 3405.  Somebody needs to fix this for real... I think we should make Kathy Brade do it (Hi Kathy!) as she introduced the bug. Anyway, approval=chofmann.

lib/mac/Misc/mactime.c

@@ -40,6 +40,7 @@ _END_C_LIB_DECL
 
 #include "xp_mcom.h" /* prototypes for GetTimeMac, Mactime, Macmktime, Macctime, Maclocaltime, Macgmtime */
 #undef ctime
+#undef mktime
 
 // Because serial port and SLIP conflict with ReadXPram calls,
 // we cache the call here