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Bump base upper bound to 4.16

`foldl (.) id fs initial` processes list in reverse order, as it makes
`f1 (f2 (f3 ... initial ..))`, not intended `... (f3 (f2 (f1 initial)))`
application.

`addFlag` was therefore accumulating `cFlags` in reverse order.
Change that to use `snoc`.
This is not linear, but hopefully we are not passing 10000 flags
to hsc2hs.

Always drain the stderror pipe to prevent hangs on Linux

winio: Make sure that with we don't use the TEMP workaround

Allow base-4.15

Compat.TempFile `#define`'d a `defined(...)` preprocessor expression,
which is undefined behavior.

Rip out inlined process changes and bump lower bound

Due to broken state of job object support in earlier releases.

It turns out that the changes necessary to fix `process` would
essentially require that we inline the entire library into `hsc2hs`.
This seems a bit excessive. Let's just bump the lower bound instead.

This reverts commit 1da063cd.

Use cc rather than gcc as default compiler

This is the morally right thing to do and fixes FreeBSD,
which ships only with clang.

Inline process changes.

Bump base upper bound to 4.15

Inline atomic actions for Windows and write more detailed diagnostics from hsc2hs

and write more detailed diagnostics from hsc2hs

* Fix nested temp calls with same base name

* hsc2hs: split Windows and Linux temp file implementation.

* hsc2hs: Fix linux warnings

* hsc2hs: Add changelog entry and rename temp file template

[ci skip]