include linux/types.h on CentOS 5 in test_sparse_basic.c

Was getting this error:

In file included from ....../libarchive-3.1.2/libarchive/test/test_sparse_basic.c:44:
/usr/include/linux/fiemap.h:15: error: expected specifier-qualifier-list before ‘__u64’
/usr/include/linux/fiemap.h:26: error: expected specifier-qualifier-list before ‘__u64’


From https://groups.google.com/forum/#!msg/libarchive-discuss/691PHz5ENOc/4OzXBevG75AJ I see that the <linux/types.h> file is not included.

This fixed the problem for me on CentOS 5.8.
It was not visible as an issue on CentOS 6.3 or Ubuntu 10 or 12.

This change did not appear to break those already functioning platforms.
Merge pull request #46 from trel/master

include linux/types.h on CentOS 5 in test/test_sparse_basic.c