kbuild: Use -nostdinc with kernel sources

Kernel code should not include userspace headers. To avoid that
happening by mistake, ask gcc not to look into the usual places
when looking for headers. We still need to find gcc headers for
vararg and similar, though - achieved by the "-iwithprefix include"
which will look into <gcc-path>/include, as proposed by Russell
King.

A similar patch went into 2.4, so not much breakage expected.

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