Use cgcc in the sparse target

cgcc is the recommended way to run sparse, since it provides
many -Defines suitable to the given gcc platform. For example,
on some Ubuntu/glibc versions, a plain sparse invocation gives
the following warning:

    "warning: This machine appears to be neither x86_64 nor i386."

Using "cgcc -no-compile" instead eliminates this warning.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Acked-by: Andreas Ericsson <ae@op5.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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