configure: fix minimum required version of libzimg

The new input properties added in 002db7d49a
were introduced to libzimg for the upcoming release 2.7.x

Signed-off-by: James Almer <jamrial@gmail.com>

configure

@@ -5943,7 +5943,7 @@ enabled libx265           && require_pkg_config libx265 x265 x265.h x265_api_get
                              require_cpp_condition x265.h "X265_BUILD >= 68"
 enabled libxavs           && require libxavs "stdint.h xavs.h" xavs_encoder_encode "-lxavs $pthreads_extralibs $libm_extralibs"
 enabled libxvid           && require libxvid xvid.h xvid_global -lxvidcore
-enabled libzimg           && require_pkg_config libzimg "zimg >= 2.6.2" zimg.h zimg_get_api_version
+enabled libzimg           && require_pkg_config libzimg "zimg >= 2.7.0" zimg.h zimg_get_api_version
 enabled libzmq            && require_pkg_config libzmq libzmq zmq.h zmq_ctx_new
 enabled libzvbi           && require_pkg_config libzvbi zvbi-0.2 libzvbi.h vbi_decoder_new &&
                              { check_cpp_condition libzvbi.h "VBI_VERSION_MAJOR > 0 || VBI_VERSION_MINOR > 2 || VBI_VERSION_MINOR == 2 && VBI_VERSION_MICRO >= 28" ||