to ruby19. Remove extension source directory from package and fix
require for extension file, since it previously depended on the copy
in the extension source directory.
a new libmysqlclient non-blocking API which utilizes co-routines. The X86
specific GCC ASM co-routine support hid the fact that there was an issue.
The only fallback code so far is POSIX user contexts which OpenBSD does not
support.
Input from and Ok sthen@ jasper@