[File] acinclude.m4: Double quote AC_LANG_PROGRAM macro

[Avinash Sonawane]

Hello!

Please find the attached patch which correctly double quotes the
AC_LANG_PROGRAM macro.[0]

Without this patch, on current master `./configure` can't detect
`tzname` and shows "checking for tzname... no" in o/p instead.

Thanks!

[0]
https://www.gnu.org/software/autoconf/manual/autoconf-2.63/html_node/Quotation-Rule-Of-Thumb.html

Regards,
Avinash Sonawane (rootKea)
https://www.rootkea.me
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