vc-intrinsics: Update to v0.20.1 and remove unused USE_NATIVE_CMAKE

[th0ma7]

Description

vc-intrinsics: Update to v0.20.1 and remove unecessary USE_NATIVE_CMAKE since docker image update to Debian 12.

Refers to #6255

Checklist

• Build rule all-supported completed successfully
• New installation of package completed successfully
• Package upgrade completed successfully (Manually install the package again)
• Package functionality was tested
• Any needed documentation is updated/created

Type of change

• Bug fix
• New Package
• Package update
• Includes small framework changes
• This change requires a documentation update (e.g. Wiki)

[th0ma7]

@hgy59 as expected USE_NATIVE_CMAKE is no longer needed. I'll let github-action run as I added small extra changes and explanations referring to this in particular.