Configure should check minimum OpenCV version about libxcam HOT 8 CLOSED

assign to @zongwave

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fixed by #479

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If user explicitly passes --enable-opencv to configure, then configure should fail if opencv < 3.0.

#479 disables opencv unconditionally if < 3.0 irregardless of --enable-opencv flag explicitly specified.

You can reference libva's configure.ac for examples on how to deal with this kind of case in configure.ac.

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@uartie you are right. sorry for the quick patch merge.
@zongwave it's not necessary to define lots small opencv versions in configure. it's just a dependence lib. and we can't only support opencv 3.0. Most of our features can come from 2.4.
- m4_define([opencv_major_version_req], [3])
- m4_define([opencv_minor_version_req], [0])
- m4_define([opencv_revision_version_req], [0])

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@windyuan IIUC OpenCV >= 3.0 is only needed if enabling OpenCL? Otherwise, OpenCV >= 2.4 is sufficient?

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@uartie Yes, you can think so. It's a little complicated we will support only CPU version if OpenCV <3.0

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minimum version still keeps 3.0.
but there's CAPI version supported for obsolete OpenCV. fixed in #495

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Bug has been fixed for a while. close this bug.
libxcam Linux build will not support <3.0 opencv since some important feature missing and API incompatible.
libxcam Android build can support the native opencv (platform/external/opencv) which has a version number (1.0)

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