Makefile: use automake rule for compiling .S

Automake seems to have its own rules for compiling an .o from an .S.
Essentially it does the same as our hand-crafted rule, but adds some
things like dependency file generation.

Remove our hand-crafted rule to use the automake rule, it is less

Signed-off-by: Pekka Paalanen <>
Tested-by: Víctor Jáquez <>
Reviewed-by: Peter Hutterer <>
1 file changed