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svn:author
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sjg
K 8
svn:date
V 27
2019-10-28T20:45:29.536883Z
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V 377
Building head on stable/11 requires libzstd

Add lib/libzstd to _elftoolchain_libs

tools/build/Makefile needs to create the install dir for libzstd
Since this would make the line too long, rework to use a list
in one per line format (easier to add in future)
and dispense with the .for loop

Reviewed by:	emaste bapt
Differential Revision:	https://reviews.freebsd.org/D220134

END