[tex-hyphen] fmtutil fails after updating hyph-utf8

[Hironobu Yamashita]

Hi,

Today fmtutil(-sys) in TeX Live r50807 fails:

> Failed to build: 8 (euptex/euptex eptex/eptex pdftex/pdftex
> euptex/uplatex pdftex/etex pdftex/pdfetex eptex/platex pdftex/eplain)

By restoring texmf-dist/tex/generic/hyph-utf8 at r50791,
it succeeds.  It seems that the change introduced in
topic "extending `hyph-zh-latn-pinyin.tex'" is the culprit.

* Engine e(u)ptex is failing at
  hyph-utf8/patterns/ptex/hyph-zh-latn-pinyin.ec.tex
  ! Non letter.
  l.201 ' 1a
  ?

* Engine pdftex is failing at
  hyph-utf8/patterns/tex-8bit/pyhyph.tex
  ! Non letter.
  l.163 1n^^fc
  ?

Regards,
Hironobu YAMASHITA