FreeBSD/ports e3bc0d6 (r496820)graphics/ilmbase Makefile

Simplify pthread + libtool workaround.

Improve upon r496818. Instead of setting both MAKE_ENV and patching ilmthread's
Makefile, just make sure PTHREAD_LIBS is set a configuration time. This is what
Debian does, and it achieves the same solution with fewer lines.

While here, add an explanation for why we need this.

PR:             236734
Approved by:    mandree (maintainer)
DeltaFile
+4-2graphics/ilmbase/Makefile
+4-21 files

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