OS/2 bustage

Didn't anyone notice the attachment I added to 86474 to prevent this?

netwerk/base/src/nsFileStreams.cpp

@@ -28,6 +28,9 @@
 #include <Files.h>
 #elif defined(XP_WIN)
 #include <windows.h>
+#elif defined(XP_OS2)
+#define INCL_DOSERRORS
+#include <os2.h>
 #else
 // XXX add necessary include file for ftruncate (or equivalent)
 #endif