Fix TUN/TAP detection on CentOS 7 (#include <sys/socket.h>) (fixes #153). #155
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Previously, "checking whether TUN/TAP is supported..." in "configure"
failed to detect TUN/TAP support due to compile errors due to "struct
sockaddr" not being defined. This fix causes sys/socket.h to be
#included if it exists.
As noted in #153 (comment): "Pull Request #64 includes a fix for this issue in BasiliskII/src/Unix/configure.ac amongst other changes." However, that PR doesn't include the #ifdef that I've included here. I'm assuming it's preferable to use the #ifdef; it certainly works for me anyway.