Preserve kabi checksum of path_is_under().

suse-commit: 1a269a2685d6ac5dca613ad56ffe730f40a8175a
Merge branch 'path_is_under-kabi' into SLE11-SP3

suse-commit: 84bb2d1cb09e2fc9e7921c8d59a0ccb3fe643bdb