lib-httpd/apache.conf: check version only after mod_version loads

Commit 0442743 introduced an <IfVersion> directive near the
top of the apache config file. However, at that point we
have not yet checked for and loaded the mod_version module.
This means that the directive will behave oddly if
mod_version is dynamically loaded, failing to match when it
should.

We can fix this by moving the whole block below the
LoadModule directive for mod_version.

Reported-by: Brian Gernhardt <brian@gernhardtsoftware.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>