K 10
svn:author
V 11
arichardson
K 8
svn:date
V 27
2018-12-14T23:53:28.343960Z
K 7
svn:log
V 347
make_dtb.sh: Use $CPP instead of assuming that cpp is in $PATH

This fixes building in CheriBSD with a strict tmp path since we don't
bootstrap a cpp but pass the full path to clang-cpp instead.

While touching this file also fix all shellcheck warnings in make_dtb.sh.

Reviewed By:	manu
Differential Revision: https://reviews.freebsd.org/D18376

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