package/openpgm: drop release- prefix to match release-monitoring.org
Autobuild has a "version bump" checker that sends message to a package
maintainer if its declared version does not match the latest one on
release-monitoring.org. In case of openpgm the version _is_ the latest one,
but a mismatch is caused by including a "release-" prefix into tags on
upstream and excluding them on other websites when referring to the
package's version.
This also fixes sha256 value for the downloaded archive.
Signed-off-by: Alexander Lukichev <alexander.lukichev@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>