Bug#507652: texlive: does not print math symbols

[Vasilis Papavasileiou <papavasileiou@gmail.com>]

I have narrowed the problem down to the fontspec package. If we pass the
cm-default value to fontspec:

  \usepackage[cm-default]{fontspec}

the example provided by Antonis works.

Math symbols used to work without cm-default. If we remove the lm-default
value from ExecuteOptions in fontspec.sty everything works fine. The problem
is probably lack of LModern math fonts in OpenType format as stated in their
README (/usr/share/doc/lmodern/README.gz).