Disable iseq-dumped builtin module for universal x86_64/arm64 binaries

During the build, Ruby has special logic to serialize its own builtin
module to disk using the binary iseq format during the build (I assume
for speed so it doesn't have to parse builtin every time it starts
up).

However, since iseq format is architecture-specific, when building on
x86_64 for universal x86_64 + arm64, the serialized builtin module is
written with the x86_64 architecture of the build machine, which fails
this check whenever ruby imports the builtin module on arm64:

https://github.com/ruby/ruby/blob/1fdaa0666086529b3aae2d509a2e71c4247c3a12/compile.c#L13243

Thankfully, there's logic to disable this feature for cross-compiled builds:

https://github.com/ruby/ruby/blob/1fdaa0666086529b3aae2d509a2e71c4247c3a12/builtin.c#L6

This disables the iseq logic for universal builds as well.

Fixes [Bug #18286]

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