Add CONFIG_64BIT_LLP64, CONFIG_POSIX_FALLOCATE and CONFIG_LINUX_FALLOCATE to Makefile.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Fix configure script for 64-bit Windows.

Hard-code config options when building using MinGW-w64 on Windows.
For 32-bit builds, CC and CONFIG_32BIT/CONFIG_64BIT will need to be
updated manually.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Fix typo (READ/DDIR_READ).

Signed-off-by: Jens Axboe <axboe@kernel.dk>