Improve comments in SPEC file, and test the --with-release option

Fix the descriptions of the %{released_kernel} and %{debugbuildsenabled} macros to match their current usage. Also improve a comment that appears above the build option tests.

Test for the --with-release option, so that %{debugbuildsenabled} can be overridden at build time without modifying the SPEC file.

Move the tests for --without-zfcpdump and --without-vdso-install so they are located next to related build options. Also move the definitions of %{debugbuildsenabled} and %{kversion} to be next to related definitions.

Closes: #42 (closed)

Signed-off-by: David Ward david.ward@ll.mit.edu