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Without this, the Windows version of sunxi-fexc might not process
files correctly.

TODO: This is really "hackish" / rather awful.
Eventually we should probably get rid of the file descriptor
based approach, i.e. open() plus _setmode(), and move to stdio
FILE* instead, which can be opened with the 'b' mode flag set.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

By defining NO_MMAP it's now possible to avoid the usage of
mmap() and munmap(). This benefits platforms that don't support
these functions, e.g. Windows.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

This way we don't have to introduce new options for retrieving
version info. For those programs that do not output their usage
by default (e.g. because they would process stdin), you may pass
a "-?" option to get help - and thus version information.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

This also avoids a possible compiler warning (-Wstring-plus-int).
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>