agl's jbig2enc windows compiled version

This is a Windows version of agl’s jbig2enc compiled by RubyPdf software under Windows XP with GCC4.2(MingW32+MSYS).
I also modified pdf.py to let it works under windows, the main feature of pdf.py is convert jbig2 to PDF.
with the jbig2, you can easily convert other format image to PDF.
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