• Be more friendly when signalfd() fails, and also add configure checks to detect
    that syscall(SYS_signalfd) actually works.  malc pointed out that some installs
    do not have /usr/include/linux headers that are in sync with the glibc headers
    so why SYS_signalfd is defined, it's #defined to _NR_signalfd which is not
    defined in the /usr/include/linux header.
    
    While this is a distro bug, it doesn't hurt to do a more thorough job in
    detection.
    
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5334 c046a42c-6fe2-441c-8c8c-71466251a162
    aliguori authored
     
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