`make test-spec` adds `-r./$(arch)-fake` to pass header options.
But the $(arch)-fake.rb unexpectedly modifies RUBY_DESCRIPTION and it
always drops +JIT from it since the fake.rb is built with BOOTSTRAPRUBY,
which can be miniruby. miniruby can't find MJIT header and thus
mjit_init_p is always FALSE.
So, to pass `make test-spec` with JIT enabled, we can't use
RUBY_DESCRIPTION.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63503 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Other ruby implementations use the spec/ruby directory.
[Misc #13792] [ruby-core:82287]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
