[FFmpeg-cvslog] configure: fix detection of libopenjpeg

ffmpeg | branch: release/3.1 | Andreas Cadhalpun | Tue Oct 11 20:28:35 2016 +0200| [1a43626fdf30ecd348809a1639af896c1c71aba5] | committer: Andreas Cadhalpun configure: fix detection of libopenjpeg Use check_lib2 to test the header together with the function.

[FFmpeg-cvslog] configure: fix detection of libopenjpeg

ffmpeg | branch: release/3.0 | Andreas Cadhalpun | Tue Oct 11 20:28:35 2016 +0200| [ada229e66fea11e33a11df2f02dc287304842a48] | committer: Andreas Cadhalpun configure: fix detection of libopenjpeg Use check_lib2 to test the header together with the function.

[FFmpeg-cvslog] configure: fix detection of libopenjpeg

ffmpeg | branch: master | Andreas Cadhalpun | Tue Oct 11 20:28:35 2016 +0200| [7a65aef00d113a38e0d1a54df49eead9df6aa15c] | committer: Andreas Cadhalpun configure: fix detection of libopenjpeg Use check_lib2 to test the header together with the function. This