Disable libraw flip

[servantftechnicolor]

Make sure libraw does not reorient our buffer.

A PR is under review at OiiO to give back the flip value even if its application is disabled.

AcademySoftwareFoundation/OpenImageIO#3669

[mugulmd]

Tested with OpenImageIO 2.4.7.0 (contains fix AcademySoftwareFoundation/OpenImageIO#3669) and RAW images with raw:flip metadata set to 5.
Results:

• without this PR: buffers are rotated (in my case dimensions should be 6744x4502 but they are 4502x6744) and Orientation metadata is 1
• with this PR: buffers are not rotated and Orientation metadata is 5.

Note: there is no need to make a PR in QtAliceVision to report the changes proposed in QtOIIO (cf . alicevision/QtOIIO#26) since QtAliceVision directly calls aliceVision::image::readImage and the bug with orientations 5 and 7 has already been fixed

[mugulmd]

Tried to create a panorama with this branch using images with flip tag 5:
there is an orientation problem when merging the different viewpoints, which leads to incoherent results.

This orientation problem is already visible at the PanoramaWarping stage, but it may already be present in the previous stages.