[Bug 785628] v4l2: Build warning on 32-bit ARM in gstv4l2object.c

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785628

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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 Attachment #356640|0                           |1
        is obsolete|                            |

--- Comment #3 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 356657
  --> https://bugzilla.gnome.org/attachment.cgi?id=356657&action=edit
v4l2object: Use mmap64 to match libv4l2 signature

I'm not completly certain this is the right fix, since I don't know if this is
portable across different libc and OS (notably BSD). It's definatly better then
downcasting (hence replacing previous patch). The problem with the blind
downcast is that it could break randomly if you have more then 4G of RAM.

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