Sync gcc3 and gcc4 knowledge of the kernel printf capabilities with reality:

kprintf supports %z, doesn't support old ddb %n/%r%z anymore, and check of
%b arguments have to occur on the next argument, like, duh.

These changes will eventually allow for kernel to be compiled without
-Wno-format, but some more casts or type changes are necessary, first.

Discussed about six months ago at s2k11, time to put this in, so that I have no excuse not to work on the format fixes diffs.

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