ncbi-rmblastn: add build dependency on cpio (#24963)

Although `cpio` is present in many environments, it may not be always
available.

The failure to build this package can be reproduced in a fresh Docker
image `debian:10`.

var/spack/repos/builtin/packages/ncbi-rmblastn/package.py

@@ -34,6 +34,7 @@ class NcbiRmblastn(AutotoolsPackage):
         archive_sha256='e746ee480ade608052306fd21f015c8a323f27029f65399275216f9a4c882d59',
         when='@2.9.0'
     )
+    depends_on('cpio', type='build')
 
     configure_directory = 'c++'