Swap to using proper windows pipes

We were using _pipe to create a pipe on windows. This uses the "int" type
for its file descriptor for compatibility. However most windows functions

Swap to using proper windows pipes

We were using _pipe to create a pipe on windows. This uses the "int" type
for its file descriptor for compatibility. However most windows functions
expect to use a "HANDLE". Probably we could get away with just casting but
it seems more robust to use the proper type and main stream windows
functions.

Reviewed-by: Rich Salz <rsalz@openssl.org>

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Add ASYNC_block_pause and ASYNC_unblock_pause

There are potential deadlock situations that can occur if code executing
within the context of a job aquires a lock, and then pauses the job

Add ASYNC_block_pause and ASYNC_unblock_pause

There are potential deadlock situations that can occur if code executing
within the context of a job aquires a lock, and then pauses the job. This
adds an ability to temporarily block pauses from occuring whilst performing
work and holding a lock.

Reviewed-by: Rich Salz <rsalz@openssl.org>

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Fix ASYNC null implementation

The ASYNC null implementation has not kept pace with the rest of the async
development and so was failing to compile.

Reviewed-by: Rich Salz <rsalz

Fix ASYNC null implementation

The ASYNC null implementation has not kept pace with the rest of the async
development and so was failing to compile.

Reviewed-by: Rich Salz <rsalz@openssl.org>

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Add ASYNC tests

Add a suite of tests for the ASYNC_* functions

Reviewed-by: Rich Salz <rsalz@openssl.org>