bzip2.rs: use the standard library for input/output streams (when they are not passed to bzip itself)

[folkertdev]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.50000% with 27 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
bzip2.rs	77.50%	27 Missing ⚠️

Files with missing lines	Coverage Δ
bzip2.rs	81.96% <77.50%> (-1.05%)	⬇️