sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

sys: Stop enabling -Wnested-externs.

clang doesn't implement this warning, so violations are only caught by
GCC. It is also no longer a common practice to use this as it was in
the original BSD code, so the need for the warning is not as important
as when it was used to do cleanups 20 years ago. A recent commit
(c3179891f897d840f578a5139839fcacb587c96d) triggers this warning on
GCC, but that commit uses nested externs purposefully.

Reviewed by: markj, emaste
Differential Revision: https://reviews.freebsd.org/D39214

sys/modules: normalize .CURDIR-relative paths to SRCTOP

This simplifies make output/logic

Tested with: `cd sys/modules; make ALL_MODULES=` on amd64
MFC after: 1 month
Sponsored by: Dell EMC Isilon

Driver 'pmspcv' added. Supports PMC-Sierra PM8001/8081/8088/8089/8074/8076/8077 SAS/SATA HBA Controllers.