Fix ASSERT0 and VERIFY0 macro typo

Ensure the value is cast to a 'long long' for printing purposes.  The
expectation is that ASSERT0/VERIFY0 are mostly used for validating
return values and thus may commonly be negative.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #246
Copy spl.release.in to kernel dir

Required when compiling ZFS in the kernel.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #253
Add --buildroot option to kmod build

This allows rpmbuild to define buildroot to point to where kernel
data is located.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #242