More portable method of installing janet.h -> janet/janet.h symlink

[dressupgeekout]

The problem that #994 was trying to solve (the symlink should be a relative path and not absolute) doesn't actually require the use of the GNU-only -t/-T option to ln(1).

[sogaiu]

To spell things out a bit...

The original proposed change looks like it was [1]:

ln -sf -t '$(DESTDIR)$(INCLUDEDIR)' janet.h janet/janet.h

What's currently in the Makefile is:

ln -sf -T ./janet/janet.h '$(DESTDIR)$(INCLUDEDIR)/janet.h' || true #fixme bsd

So it looks like there was a change to the original at some point.

Doing some digging, came across this.

Perhaps @shassard and/or @LeviSchuck would be interested in this topic.

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[1] Which did get committed.