2933 compiler warning gags need better granularity
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>

6692913 MBLKL generates E_PTRDIFF_OVERFLOW lint warnings
6717598 MBLKSIZE() causes lint pointer-difference warnings

PSARC 2007/584 sfe ethernet driver
6630192 SiS900 series 10/100 Fast Ethernet support (sfe)