libgo patch committed: Fix fd_select.go

[Ian Lance Taylor]

This patch fixes fd_select.go for the changes in FD handling in the
latest libgo update.  The code in libgo now takes advantage of the fact
that if you change the set of descriptors used by epoll, it is not
necessary to wake up the thread waiting in epoll_wait.  That is not true
of select: if you change the set of descriptors, you do have to wake up
the select.  This patch implements that.  Bootstrapped on
x86_64-unknown-linux-gnu.  Ran Go testsuite using fd_select.go instead
of fd_linux.go.  Committed to mainline.  This fixes PR go/48312.

Ian

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