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enable hid kensington trackball driver - fixes #7007
enable backlight to chromebook keyboard - fixes #6987

the zfs modules are built from sources with the RAP plugin so they
should should work just fine.

disable CONFIG_WAN

http -> https
ftp.kernel.org -> kernel.org

ref #6695

fixes #6529

otherwise it's non-trivial to build modules. and seems to be the
only sane way to setup flags so that the kbuild tests get it right
for stack protector tests.

KCFLAGS is too late for gcc flags detection logic. So embed the
-fno-pie flag directly to CC. This fixes the error:
Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler

fixes #5191
fixes #6486

fixes #6425