Remove $(ASFLAGS) from build system and assemble with $(CFLAGS) instead

We already assemble our assembly files using the $(CC) compiler driver,
rather than the actual $(AS) assembler. This means that

* The C preprocessor gets run on the assembly file
* It's valid to pass gcc-style flags to it, like e.g.
  -mbranch-protection or -fcf-protection
* If you do so, the relevant preprocessor macros like __CET__ get set
* If you really wanted to pass assembler flags, you would need to do
  that using -Wa,... anyway

So I think it makes sense to pass "$(XCFLAGS) $(CFLAGS) $(CPPFLAGS)" to
gcc/clang/etc when assembling, rather than passing $(ASFLAGS) (since
the flags are not actually passed to `as`, but `cc`!).

The side effect of this is that if there are mitigation flags like
-fcf-protection in $CFLAGS, then the relevant macros like __CET__ will
be defined when assembling the files.

[Bug #20601]

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