maintainer-prepare-release: remove redundant 'make check'
maintainer-prepare-release: remove redundant 'make check'

Jonny was upset that running `make maintainer-make-release` ran both
'check' and 'distcheck'. We think that just running the build before
making distcheck should be enough.

Reviewed-by: Jonny Lamb <3d1fb3642aaab2ff70e3392a5ab916bf99eed6a3@collabora.co.uk>

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib