Makefile: Use make variables for static checker configuration

Our cppcheck and clang-tidy rules don't really follow normal Makefile
conventions.  Usually any commands other than the very basics have their
binary specified in a variable so it can be overridden on the command line
if they're in an unusual location.  Implement that for $(CPPCHECK) and
$(CLANG_TIDY)

Likewise flags to tools usually have their own Make variable.  Do the same
with $(CLANG_TIDY_FLAGS) and $(CPPCHECK_FLAGS).  Note that these only have
the options specifically for the static checker, not compiler flags which
we are also supplying to the static checker - those are derived from
FLAGS / CFLAGS / CPPFLAGS as before.

As part of that we change the probing for --check-level=exhaustive from
being run as part of the cppcheck target, to being run when we build the
CPPCHECK_FLAGS variable.  That doesn't make any real difference now, but
will make things nicer if we need multiple cppcheck targets in future (e.g.
for passt-repair).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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