Log Message:
mold: update to 1.4.2.

New features and bug fixes:

- [RV32] We've fixed several issues for 32-bit RISC-V. mold can now build
  complex programs including itself for the target.
- [ARM32] mold gained range extension thunks so that it can now link programs
  whose .text is larger than 16 MiB. Previously, mold couldn't link such large
  programs. We've also fixed general stability issues for ARM32.