mattn / go-sqlite3 / 1032

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master: 54%

Pull #785

travis-ci

SQLiteConn: Add 'Raw' method to give access to underlying sqlite3 context structure

This is necessary, for instance, to allow users of the package to make
their own CGo callbacks, and have the underlying sqlite3 library call
those C functions directly.

Note that the intention from the sqlite3 library seems to be that
there should be a measure of binary compatibility between versions:
even extensions compiled against an older different version of sqlite3
should be able to call sqlite3_create_function with no problems. So
this should work even if users of the package have a slightly
different version of the sqlite3.h header.

Note that the code itself was written by @rittneje.  I tested it and
wrote the comments.

Signed-off-by: George Dunlap <dunlapg@umich.edu>

v2:
Just copy @rittneje's code exactly:
- Grab the lock while the function is running
- Replace the error code with our own if it's of type ErrNo

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