redhat/Makefile: Use new BUILD_TARGET for RHEL dist[g]-brew target

Prarit Bhargavarequested to merge
prarit/kernel-ark:rhel-9-newest-test-pesign into os-build

A new generic build target, rhel-9-newest-test-pesign, has been added to
brew. This target points to the newest RHEL9 pesign build image.

As a result of this change,

'make DIST=.el9 dist-brew' results in

brew build --scratch rhel-9-newest-test-pesign /home/prarit/git-kernel/kernel-ark/redhat/rpm/SRPMS/kernel-6.1.0-0.rc2.20.test.el9.src.rpm

'make DIST=.eln dist-brew' results in

brew build --scratch eln /home/prarit/git-kernel/kernel-ark/redhat/rpm/SRPMS/kernel-6.1.0-0.rc2.20.test.eln.src.rpm

'make DIST=.fc37 dist-brew' results in

brew build --scratch rawhide /home/prarit/git-kernel/kernel-ark/redhat/rpm/SRPMS/kernel-6.1.0-0.rc2.20.test.fc37.src.rpm

Signed-off-by: Prarit Bhargava prarit@redhat.com

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