gitweb: remove "test" and "test-installed" targets

Remove the special "test" targets for gitweb added in 958a8467216 (gitweb/Makefile: Add 'test' and 'test-installed' targets, 2010-09-26). Unlike e.g. "contrib/scalar" and "contrib/subtree" the "gitweb" tests themselves live in our top-level t/ directory. It therefore doesn't make sense to maintain this indirection, no more than it would to have a "git-send-email-test". By dropping it we'll also free other tests to use the t95*.sh prefix. These removed targets are unlikely to be used by anyone, and to the extent that they are we can easily use an invocation like this instead: make test T='t[0-9]*gitweb*.sh' Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>