perl/Makefile: install Git::SVN::* when NO_PERL_MAKEMAKER=yes, too

perl/Makefile: install Git::SVN::* when NO_PERL_MAKEMAKER=yes, too

v1.7.11-rc1~12^2~2 (2012-05-27) and friends split some git-svn code
into separate modules but did not update the fallback rules to install
them when NO_PERL_MAKEMAKER is set.  Add the appropriate rules so
users without MakeMaker can use git-svn again.

Affected modules: Git::SVN::Prompt, Git::SVN::Fetcher,
Git::SVN::Editor, Git::SVN::Ra, Git::SVN::Memoize::YAML.

Reported-by: Adam Roben <adam@roben.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmali.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>