libgo patch committed: Check for EINTR in network code

[Ian Lance Taylor]

Since gccgo uses signals to manage garbage collection, having a system
call return EINTR most likely just means that the garbage collector
ran.  This patch fixes the networking code in libgo to just retry after
getting EINTR.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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