enable cygwin's TeXLive for Windows

[jarnowic]

When trying to run

pandoc -o filename.pdf filename.md

on Window's Cygwin shell, the job fails with the error

pandoc.exe: pdflatex not found. pdflatex is needed for pdf output.

It seems that Pandoc's routine on Windows tries to find an executable for pdflatex/xelatex/lualatex, and these are only symlinks to the actual executables pdftex/xetex/luatex on cygwin.

From the google group thread on this topic, it seems that the solution is bypassing a check for the executable in Pandoc's routine, and let the TeX engine fail on its own, if that is the case.

[jarnowic]

found a workaround: it's a kludge, but a solution nonetheless: instead of using the symlinks to [pdf|xe|lua]tex.exe, I did make a copy into [pdf|xe|lua]latex.exe, and pandoc didn't complain.