use of AC_TRY_EVAL broken

[Eric Blake]

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The following gnulib files use an undocumented autoconf macro AC_TRY_EVAL,
which is buggy because it does not prevent against shell glob expansion
and could end up invoking arbitrary commands according to the contents of
the current directory.  We need to switch these over to using documented
commands, particularly since I'm thinking of removing AC_TRY_EVAL from the
next version of autoconf because of its security risks.

locale-fr.m4
locale-tr.m4
locale-zh.m4
printf.m4

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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