If a recipe is using the autotools class then presumably it is using Makefiles.
However the default do_compile() is forgiving and silently handles a missing
makefile, which means that if a recipe is using a hand-coded static Makefile
(e.g. git) but doesn't use brokensep the recipe will fail in do_install.
To make debugging this easier, override do_compile in autotools so that it fails
if a Makefile isn't present.
Signed-off-by: Ross Burton <ross.burton@intel.com>