[tlbuild] Failures on Solaris (LuaTeX, Harfbuzz)

[Karl Berry]

    On Sparc Solaris there's an issue with

Not because of this failure, but maybe it's time to drop sparc-solaris
binaries in general?

    Harfbuzz is broken on Solaris. [...]
    error: no match for 'operator*' (operand types are 'float' and 'const
    HBINT8 {aka const OT::IntType<char, 1u>}')
          delta += scalar * *bcursor++;

If anyone has a patch or workaround, that would be great.  I don't know
when I'll be able to look at it, but it won't be especially
soon. --thanks, k.