11.86; correct "--engine" setup/customization to generate pdf output with ConTeXt

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Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.

Be sure to consult the FAQ section in the manual before submitting
a bug report. In addition check if the bug is reproducable with an
up-to-date version of AUCTeX. So please upgrade to the version
available from http://www.gnu.org/software/auctex/ if your
installation is older than the one available from the web site.

If the bug is triggered by a specific (La)TeX file, you should try
to produce a minimal sample file showing the problem and include it
in your report.

Your bug report will be posted to the AUCTeX bug reporting list.
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I tried to set the variable ConTeXt-engine  to "pdftex" nil or 'pdftex 
with no success.

the context-buffer:

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