Ben Wolsieffer 2aa398f3aa Use autoconf variable for C preprocessor
This fixes the build when cross-compiling, where the preprocessor might
be prefixed.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Ben Wolsieffer <benwolsieffer@gmail.com>
Closes #8180
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