Clean up net header code and placement#103

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dee12452 wants to merge 8 commits intops3dev:developfrom dee12452:net-cleanup-develop

Commits on Jul 3, 2020

Cleaned up net headers: moved socket, poll, select to sys. Put lv2 sysNet functions in their own header in sysutil. Moved netdb.h to root of include/. I know this will address ps3dev#5
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Fixed libnet failed to find socket.h
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Completely forgot sys/
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Including ppu-types for short int defs
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Moved extern 'C' down in net.h to where the functions are defined
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Fixed librt socket.c missing sys net functions
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Adding back socket.h to root of include/ for backwards compat (fixes ps3lib install)
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Added poll and select headers to root of include/, seems it is needed for backwards compat with net/net.h includes
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