[Bug #21723] Let `binding.irb` properly load irb by fixing force_activate()

This patch fixes a problem where `binding.irb` (= force_activate('irb'))
fails under `bundle exec` when the Gemfile does not contain `irb` and
does contain a gem which is (1) not installed in GEM_HOME (2) sourced
using `path:`/`git:`.

The original approach constructing a temporary definition fails since
it does not set the equalivent of `path:`/`git:`.

Always reconstructing a definition from a Gemfile and applying lockfile
constraints should be a more robust approach.

[Bug #21723]

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