Issue #85: Fix some compilation issues of bootloader on Windows.
Issue #85: Move functions stb_fullpath and stb_printf to pyinstaller bootloader code.
Issue #85: Move file ./bootloader/windows/utils.c to ./bootloader/common/pyi_win32_utils.c.
Issue #85: Copy function stb_to_utf8 from stb.h fileto bootloader code.
Issue #85: In bootloader replace define WIN32 by _WIN32.
Issue #85: In bootloader drop includion of header stb.h.
Issue #85: Add ordlookup modules for Python library pefile.
Issue #85: Copy fopen wrappers from stb.h into bootloader code.