Linux 6.19 compat: in-tree build: fix duplicate GCM assembly functions

[AttilaFueloep]

Motivation and Context

Linux 6.19 added an AES-GCM VAES-AVX2 assembly implementation. It's basically a translation from the BoringSSL perlasm syntax to macro assembly. We're using the same source but the perlasm generated flat assembly which shares some global function names with the former. When building in-tree this results in the linker failing due to the duplicate symbols.

Closes #18204

Description

To avoid the error we prepend icp_ via a macro to our function names.

How Has This Been Tested?

Compiled and manually tested with nm that the rename worked as expected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Quality assurance (non-breaking change which makes the code more robust against bugs)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[alex-moch]

I just applied the patch. Works for me.

Thanks for the PR!