Use cc -E instead of cpp for the preprocessor by default. cc -E is

correct for C sources that are compiled by cc, while cpp (/usr/bin/cpp)
is bogus since it invokes /usr/libexec/cpp with different flags.
1.1.5 uses plain cc.  This should be equivalent after -M is added, but
cc -M foo.s is completely broken (it invokes the assembler) while
cc -E -M foo.s just does nothing instead of generating a foo.o: foo.s
dependency.

IF $MKDEP_CPP is set, use it as the cpp instead of cc -E.  Assembler
sources that are preprocessed using cpp directly should be mkdep'ed
with MKDEP_CPP=cpp.  Such sources shouldn't exist but we still have
lots.  foo.S should be compiled by cc -traditional (cc will invoke the
preprocessor) and foo.s should be compiled by cc (cc won't invoke the
preprocessor).

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