[Bug 248818] clang11 import breaks WANT_LINKER_VERSION check forcing extra cross-tools to be built

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248818

--- Comment #2 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: bz
Date: Fri Aug 21 22:31:46 UTC 2020
New revision: 364466
URL: https://svnweb.freebsd.org/changeset/base/364466

Log:
  After the clang/llvm version 11 import LLD_VERSION is no longer used
  upstream so Version.inc now only defines LLD_VERSION_STRING.

  This breaks the WANT_LINKER_VERSION magic and might lead to us building
  more than needed (e.g., for croos-tools).

  Change the awk script to parse LLD_VERSION_STRING instead of LLD_VERSION,
  which not only unbreaks the current situation but should also be backwards
  compatible as dim points out.

  PR:           248818
  Reviewed by:  emaste, dim (seems right and the way to go)
  MFC after:    4 weeks
  X-MFC before: 364284

Changes:
  head/Makefile.inc1

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