[cc65] Building with custom CC and CFLAGS

I thought I'd try building the new snapshots with clang instead of
gcc, to see what the static analyzer would catch. Unfortunately all 14
gcc.mak files explicitly set CC and CFLAGS, instead of inheriting
values from the main makefile, making it a real chore. As the CC and
CFLAGS values vary a bit, I can't easily fix it with a perl oneliner
either...
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