patchelf: update to 0.15.0.

PatchELF 0.15.0

What's Changed:

- Add --add-debug option by @deadw00d in #367
- Add O_BINARY flag when opening files to allow compilation for Windows by
  @JagoGyselinck in #372
- Document --print-needed by @klemensn in #375
- modifyRPath: return early if new and old rpath are empty by @ehmry in #376
- Add comment explaining calculation for DT_MIPS_RLD_MAP_REL by @amjoseph-nixpkgs
  in #379
- Add --no-sort option by @amjoseph-nixpkgs in #378
- Handle DT_MIPS_XHASH and .MIPS.xhash by @amjoseph-nixpkgs in #380

(fcambus)