[issue10785] parser: store the filename as an unicode object

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

When testing my patch, I found and fixed two bugs in pgen:
 - r87557: PGEN was not defined to compile pgenmain.c and printgrammar.c
 - r87558: pgen error was ignored on "make Parser/pgen.stamp" (when executing pgen to compile the grammar)

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<http://bugs.python.org/issue10785>
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