[PATCH] Implement platform autodetection when possible

[Evan Hanson]

Hi there,

Here's a signed-off version of the latest patch, including removing the
handling of iOS as John suggested. I've also fixed the capitalisation of
the Haiku platform name, added a bit more info to the NEWS entry, and
moved it into the correct section.

This has been tested and works correctly on the following platforms:

 - Cygwin
 - DragonflyBSD
 - FreeBSD
 - Haiku
 - Linux
 - MSYS2
 - MinGW
 - NetBSD
 - OpenBSD

Given that the PLATFORM can still be provided manually, I'm happy for
this to go in. Thank you to John for the changes, and to Alex for the
detection code in the first instance.

Evan

0001-Implement-platform-autodetection-when-possible.patch
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