Ryan Libby 1ee339e257 openzfs: fix gcc in-kernel builds
Fix gcc builds of in-kernel modules using CDDL_CFLAGS (e.g. options
ZFS).

 - Remove nonexistent include dirs for -Wmissing-include-dirs
 - Suppress -Wnested-externs, a useless warning
 - Sort and uniq warning flags while here

Reviewed by:	markj
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D27684
2020-12-24 12:34:18 -08:00
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