clang: default to DWARF 4 as of FreeBSD 13

clang: default to DWARF 4 as of FreeBSD 13

FreeBSD previously defaulted to DWARF 2 because several tools (gdb,
ctfconvert, etc.) did not support later versions.  These have either
been fixed or are deprecated.

Note that gdb 6 still exists but has been moved out of $PATH into
/usr/libexec and is intended only for use by crashinfo(8).  The kernel
build sets the DWARF version explicitly via -gdwarf2, so this should
have no effect there.

PR:		234887 [exp-run]
Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17930