[tex-live] TL2017's dvipdfmx prints warnings that no earlier TL one does.

[jack]

Ever since TeXLive 2017 came out, dvipdfmx is throwing weird warning
messages when I use garamond as the font, when the exact same document
involves no such warnings in prior years of TeXLive.

Consider the following tiny sample, which we can call "demo.tex"

\documentclass{article}
\usepackage[mdugm]{mathdesign}
\begin{document}
[foo]
\end{document}

If I run `latex demo.tex`, followed by `dvipdfmx demo`, I do get a pdf
created but the following messages get shown:

  atemplate-2 -> atemplate-2.pdf
  [1]
  xdvipdfmx:warning: Glyph width mismatch for TFM and font (md-gmr8t)
  xdvipdfmx:warning: TFM: 375.402 vs. Type1 font: 374
  xdvipdfmx:warning: Glyph width mismatch for TFM and font (md-gmr8t)
  xdvipdfmx:warning: TFM: 375.402 vs. Type1 font: 374

These never appeared prior to TeXLive 2017, even with the exact same
sample document and even though I have the garamond fonts installed in the
same location.  (Namely, I have a symlink in
$TL2017/texmf-local/fonts/type1 called "urw" that points to a folder in my
$HOME.  This has worked flawlessly for years.) I have this problem on
multiple machines.

I'm not a TeX expert, but I don't see why there would suddenly be a
mismatch between metrics and what the font says.  Those garamond fonts
have not changed in years as far as I know.  I got them from the
"garamond" package on CTAN, which hasn't changed in years.  I seem to
recall the directions in there told me that all I need are: ugmm8a.pfb,
ugmmi8a.pfb, ugmr8a.pfb, and ugmri8a.pfb.  That is indeed what is in the
dir that my symlink points to.

It is worth noting that in the sample document, if I just delete the
square brackets surrounding "foo", the warning messages go away.

-Jack