[patch] tex2lyx crash when full path is given from commandline on Win32

[hzluo]

This patch addresses problem of bug:

http://bugzilla.lyx.org/show_bug.cgi?id=3788

The commandline parameters are supposed to be converted
to internal path via os::internal_path(), but tex2lyx
forgot to call it. Then an assertion in FileName::FileName()
is triggled due to '\\' in the path.
This patch adds these calls.

Please test and give me comments. Thanks!

Hangzai

win32path.diff
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