Automatically detect path to original pdflatex binary

[blochberger]

The path to the original pdflatex is not detected automatically, but still hard-coded in order to avoid calling the wrapper (which probably occurs first in PATH). The path currently is /Library/TeX/texbin/pdflatex – the default path of pdflatex if you are using MacTeX, see:

pdflatex-hl/pdflatex

Lines 41 to 43 in f544e98

	def original_pdflatex():
	# TODO Discover `pdflatex` in PATH without discovering this wrapper
	return '/Library/TeX/texbin/pdflatex'