headers: Add new constants in sqlext.h

Required for pyodbc https://github.com/mkleehammer/pyodbc
Fixes https://github.com/mingw-w64/mingw-w64/issues/93

Signed-off-by: Biswapriyo Nath <nathbappai@gmail.com>
Signed-off-by: LIU Hao <lh_mouse@126.com>
1 file changed