Remove support for libmysql-client from mysqli test suite

Since mysqli can no longer be built against libmysql-client, there is
no longer the need to distinguish.

While we're at

Remove support for libmysql-client from mysqli test suite

Since mysqli can no longer be built against libmysql-client, there is
no longer the need to distinguish.

While we're at it, we also drop the superfluous is_object() checks.

Closes GH-9652.

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Fix libmysql test cases (#7097)

Fixed test cases for: mysqli_stmt_execute_bind_libmysql, bug77935, fetch_column, and some others that failed on libmysql

Port skipif.inc files to EXTENSIONS

Add CLEAN sections to mysqli and PDO mysql tests

Closes GH-6756.

MySQLnd: Support cursors in store/get result

This fixes two related issues:

1. When a PS with cursor is used in store_result/get_result,
perform a COM_FETCH with maximum numb

MySQLnd: Support cursors in store/get result

This fixes two related issues:

1. When a PS with cursor is used in store_result/get_result,
perform a COM_FETCH with maximum number of rows rather than
silently switching to an unbuffered result set (in the case of
store_result) or erroring (in the case of get_result).
In the future, we might want to make get_result unbuffered for
PS with cursors, as using cursors with buffered result sets
doesn't really make sense. Unlike store_result, get_result
isn't very explicit about what kind of result set is desired.
2. If the client did not request a cursor, but the server reports
that a cursor exists, ignore this and treat the PS as if it
has no cursor (i.e. to not use COM_FETCH). It appears to be a
server side bug that a cursor used inside an SP will be reported
to the client, even though the client cannot use the cursor.

Fixes bug #64638, bug #72862, bug #77935.

Closes GH-6518.

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