makes X11 binaries able to actually work: most of them were previously hang
in infinite loop wiaiting for data from the X server because SIOCNREAD
reported that some data where to be read whereas the X server had nothing
to say.
Tested (and works): xlogo, xterm, ghostview (IRIX build). Things are getting
interesting...
Service happy. Code in libc attempts to open files in the ns filesystem, and
then uses getmountid on failure to ensure that the ns filesystem is really
mounted. We don't emulate the ns filesystem yet, but getmountid now correctly
reports that ns is not present.
Note: It seems that the mountid of the ns filesystem should always be
00000005 00000000 00000000 7fff3000
