package: remove non-conventional prefix/suffix from tarball-fetched packages

package: remove non-conventional prefix/suffix from tarball-fetched packages

While most projects name their tarball <name>-<version>, where
<version> is just the version number, some other projects add some
prefix and/or suffix to their version number.

In Buildroot, we currently encode the full version (with its
prefix/suffix) in the <pkg>_VERSION variable. However, that doesn't
work well to match version numbers with the release-monitoring.org
website, which filters such prefixes/suffixes.

This commit therefore removes the prefix/suffix from tarball-fetched
packages. The name of the files being downloaded does not change.

Signed-off-by: Victor Huesca <victor.huesca@bootlin.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>