kbuild: Fail if gold linker is detected

The gold linker has known issues of failing the build both in random and in
predictible ways:

 - The x86/X32 VDSO build fails with:

   arch/x86/entry/vdso/vclock_gettime-x32.o:vclock_gettime.c:function do_hres:
   error: relocation overflow: reference to 'hvclock_page'

   That's a known issue for years and the usual workaround is to disable
   CONFIG_X86_32

 - A recent build failure is caused by turning a relocation into an
   absolute one for unknown reasons. See link below.

 - There are a couple of gold workarounds applied already, but reports
   about broken builds with ld.gold keep coming in on a regular base and in
   most cases the root cause is unclear.

In context of the most recent fail H.J. stated:

  "Since building a workable kernel for different kernel configurations
   isn't a requirement for gold, I don't recommend gold for kernel."

So instead of dealing with attempts to duct tape gold support without
understanding the root cause and without sup...