Cleaning up ifdefs, adding BeOS case.

mailnews/imap/src/nsImapProtocol.cpp

@@ -58,16 +58,14 @@ PRLogModuleInfo *IMAP;
 #include "nsIImapIncomingServer.h"
 
 // for temp message hack
-#ifdef XP_UNIX
+#if defined(XP_UNIX)
 #define MESSAGE_PATH "/usr/tmp/tempMessage.eml"
-#endif
-
-#ifdef XP_PC
+#elif defined(XP_PC)
 #define MESSAGE_PATH  "c:\\temp\\tempMessage.eml"
-#endif
-
-#ifdef XP_MAC
+#elif defined(XP_MAC)
 #define MESSAGE_PATH  "tempMessage.eml"
+#elif defined(XP_BEOS)
+#define MESSAGE_PATH "/tmp/tempMessage.eml"
 #endif