Adjust script for patching glibc 2.27

[bartekb81]

Arch upgraded to glibc 2.27, the old qldv does not work anymore (noticible when using swift-bin).

Current implementation of version checks is here: https://github.com/bminor/glibc/blob/glibc-2.27/elf/dl-version.c and it's different from 2.26. I adjusted the script accordingly:

• 10129: the verbose parameter lands via esi in [rsp+0x48],
• 103e0: value from [rsp+0x48] lands in edx - this is the line that I replace with xor edx, edx and a few nops

old:

   103e0:	8b 54 24 48          	mov    edx,DWORD PTR [rsp+0x48]

new:

103e0:	31 d2                	xor    edx,edx
103e2:	90                   	nop
103e3:	90                   	nop

[refi64]

Thanks for the heads up!

That being said, this solution isn't really ideal. The core problem seems to more be that we're changing the wrong test; there's a test instruction immediately following the mov that seems to be the proper one.

I have a fix, but I have to test it under Flatpak first. Should be ready later today...

[refi64]

Ok, it should be fixed now, and the new package is up on AUR.