[flang] Force the use of intrinsic builtins in type_info

This ensures that the __Fortran_builtins module is always used
as an intrinsic module by __Fortran_type_info, which avoids issues
when, for instance, the intrinsic modules dir is present in the
include paths.

Fixes https://github.com/llvm/llvm-project/issues/63592

Reviewed By: klausler

Differential Revision: https://reviews.llvm.org/D154452