livepatch/klp-build: Introduce fix-patch-lines script to avoid __LINE__ diff noise

livepatch/klp-build: Introduce fix-patch-lines script to avoid __LINE__ diff noise

The __LINE__ macro creates challenges for binary diffing.  When a .patch
file adds or removes lines, it shifts the line numbers for all code
below it.

This can cause the code generation of functions using __LINE__ to change
due to the line number constant being embedded in a MOV instruction,
despite there being no semantic difference.

Avoid such false positives by adding a fix-patch-lines script which can
be used to insert a #line directive in each patch hunk affecting the
line numbering.  This script will be used by klp-build, which will be
introduced in a subsequent patch.

Acked-by: Petr Mladek <pmladek@suse.com>
Tested-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>