s390/kpatch-build: add -fPIC flag with -mno-pic-data-is-text-relative

[sumanthkorikkar]

s390/kpatch-build: add -fPIE flag with -mno-pic-data-is-text-relative

-mno-pic-data-is-text-relative compiler flag expects -fPIC/-fPIE flag
along with it.  Since kernel commit 778666df60f0 ("s390: compile
relocatable kernel without -fPIE"), the -fPIC/-fPIE flag is missing when
creating kpatch module and this can lead to the following error:

cc1: error: ‘-mno-pic-data-is-text-relative’ cannot be used without
‘-fpic’/‘-fPIC’.

Previously kpatch-build didnt show up this issue, as the previous kernel
was built with -fPIE.

However, kpatch build could fail with kernel commit 778666df60f0 ("s390:
compile relocatable kernel without -fPIE"), where -fPIE is not included.
Hence, include it in kpatch-build for all kernels < 6.10.0

Note:
Latest s390 kernel is built with -fPIC flag.
i.e. kernel commit 00cda11d3b2e ("s390: Compile kernel with -fPIC and
link with -no-pie"). Hence, there is no need to explicitly add it again
in kpatch-build.

git tag --contains 00cda11d3b2e
next-20240430
next-20240502
next-20240607
next-20240613
v6.10-rc1
v6.10-rc2
v6.10-rc3

[joe-lawrence]

Thanks, @sumanthkorikkar