sh: also try passing -m4-nofpu for SH2A builds

sh: also try passing -m4-nofpu for SH2A builds

When compiling a SH2A kernel (e.g.  se7206_defconfig or rsk7203_defconfig)
using sh4-linux-gcc, linking fails with:

  net/built-in.o: In function `__sk_run_filter':
  net/core/filter.c:566: undefined reference to `__fpscr_values'
  net/core/filter.c:269: undefined reference to `__fpscr_values'
  ...
  net/built-in.o:net/core/filter.c:580: more undefined references to `__fpscr_values' follow

This happens because sh4-linux-gcc doesn't support the "-m2a-nofpu",
which is thus filtered out by "$(call cc-option, ...)".

As compiling using sh4-linux-gcc is useful for compile coverage, also
try passing "-m4-nofpu" (which is presumably filtered out when using a
real sh2a-linux toolchain) to disable the generation of FPU instructions
and references to __fpscr_values[].

Signed-off-by: Geert Uytterhoeven <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Tony Breeds <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Fengguang Wu <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Magnus Damm <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>