Fix the build, add a missing file

some config.w32 fixes
moved mysqlnd's block allocator to a separate file and also now
it's part of the connection, no MT problems.

More optimizations - less MM calls
Clearly separated fetching (physical reading) from decoding phases (data
interpretation). Threaded fetching added but disabled as needs more work for
Wi

More optimizations - less MM calls
Clearly separated fetching (physical reading) from decoding phases (data
interpretation). Threaded fetching added but disabled as needs more work for
Windows. For Linux needs some touches to add pthreads if this is enabled,
probably with a compile-time switch.
The code reorganisation makes it easy to add also async API, similar to
cURL's one.

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MFH: fix win32 compile

Merge with internal version

- Fix problems with double definitions
- Clean up a bit a type mess - 4 types less. No need to have aliases
for the same thing (unification is the name).
- New macro for Johannes mysqln

- Fix problems with double definitions
- Clean up a bit a type mess - 4 types less. No need to have aliases
for the same thing (unification is the name).
- New macro for Johannes mysqlnd_stmt_ro_result_metadata

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MFH: Bump copyright year, 2 of 2.

Fix build for mysqlnd

Import mysqlnd
Patch ext/mysql and ext/mysqli to support mysqlnd