sse-multiplexd.c: fix leaking pipe FDs #259
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sse-multiplexd leaks pipe FDs to its child processes, so newer children keep the older ones alive when they should have received a SIGPIPE already
fixes freifunk-gluon/gluon#2468
@NeoRaider I don't really know what to write as a commit message, you are very welcome to open a PR yourself, edit this one or whatever. My intention is just to get the fix upstream. In today's FFRN nightly I had already patched it in, but of course I would like to get rid of the downstream patch quickly.