libtasn1: update to 4.21.0

[OneTrueC]

Testing the changes

• I tested the changes in this PR: briefly (been running for 2 days w/ no issue)

Local build testing

• I built this PR locally for my native architecture, x86_64
• I built this PR locally for these architectures (if supported. mark crossbuilds):
  • aarch64-musl (cross)
  • aarch64 (cross)
  • armv5tel-musl (cross)
  • armv5tel (cross)
  • armv6l-musl (cross)
  • armv6l (cross)
  • armv7l-musl (cross)
  • armv7l (cross)
  • i686-musl (cross)
  • i686 (cross)

Adding the texinfo hostmakedependency may be unnecessary, but I didn't get too intimate with it.

fixes:

CVE-2025-13151

[Duncaen]

Adding the texinfo hostmakedependency may be unnecessary, but I didn't get too intimate with it.

Why do you do it then, the previous version contained the info files already.