PC-BSD/trueos 4850051share/mk bsd.sys.mk, sys/arm/conf DB-88F5XXX DB-88F6XXX

MFC: r351429,351430,351485,351497,351498

Merge changes to turn off -Werror for gcc 4.2.1 by default as part of
the plan to deorbit gcc 4.2.1 from -head before 13.0.

Relnotes: Yes
DeltaFile
+9-0share/mk/bsd.sys.mk
+5-1sys/conf/kern.pre.mk
+5-0sys/conf/kmod.mk
+0-2sys/arm/conf/DB-88F5XXX
+0-2sys/arm/conf/DB-88F6XXX
+0-2sys/arm/conf/SHEEVAPLUG
+0-2sys/arm/conf/SOCFPGA
+0-2sys/arm/conf/TS7800
+0-2sys/arm/conf/VYBRID
+1-1sys/conf/files.amd64
+1-1sys/conf/files.i386
+1-1usr.sbin/pmcstudy/Makefile
+0-2sys/arm/conf/ARMADAXP
+0-2sys/arm/conf/DB-78XXX
+1-1sys/modules/linux/Makefile
+1-1sys/modules/linux64/Makefile
+1-1sys/powerpc/conf/QORIQ64
+1-1sys/powerpc/conf/dpaa/DPAA
+0-1sys/powerpc/conf/MPC85XX
+0-1sys/arm/conf/RT1310
+0-1sys/arm/conf/ARMADA38X
+0-1sys/powerpc/conf/MPC85XXSPE
+0-1sys/arm/conf/ALPINE
+26-2923 files

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