bash should retry a fork() returning EAGAIN

[Martin Koeppe]

Hi all,

I'm using bash 3.1 on interix. There fork() may fail with EAGAIN if 
e.g. several builds (configures) are running in parallel. 
Unfortunately, fork() isn't retried and configure stops.

So I suggest adding this patch to bash which retries fork() when it 
fails with EAGAIN.  Idea is from pdksh.  At least 3.2 doesn't have 
such a patch, I didn't look though all the patches after 3.2, however.

Martin

bashfork.diff
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