misc: quiet minor build warnings, ignore generated files

Quiet a couple of build warnings in tst_libext2fs.c
Add missing unistd.h header for misc/util.c.

Ignore generated files for lib/ext2fs/tst_libext2fs and intl/ files.

Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
3 files changed