dev-lang/ruby: fix build during bootstrap

Fix building during a bootstrap situation where no ruby is present yet.
Normally ruby uses a pregenerated miniprelude.c file for a miniruby that
is functional enough to assist the build process. Since we now patch
gem_prelude.rb in f6aa0fc2dcee195658e697026e607dbb91bfd31d the Makefile
tries to regenerate miniprelude.c, but this first requires a working
ruby, leading to build failures.

By resetting the date of the patched gem_prelude.c we can avoid this.
The gem_predule.rb patch is intended to be used in an installed ruby and
does not affect the miniruby usage.

Closes: https://bugs.gentoo.org/787137
Package-Manager: Portage-3.0.18, Repoman-3.0.2
Signed-off-by: Hans de Graaff <graaff@gentoo.org>

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