configure: Use pkg-config for libdc1394 discovery
Since not all systems need the libraw1394 dependency, let pkg-config provide the list of libraries actually needed. The libdc1394-2.pc file has been included since version 2 (2008-01-05), so it should be safe to use.
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configure
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@ -4248,7 +4248,7 @@ fi
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# libdc1394 check
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if enabled libdc1394; then
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{ check_lib dc1394/dc1394.h dc1394_new -ldc1394 -lraw1394 &&
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{ require_pkg_config libdc1394-2 dc1394/dc1394.h dc1394_new &&
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enable libdc1394_2; } ||
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{ check_lib libdc1394/dc1394_control.h dc1394_create_handle -ldc1394_control -lraw1394 &&
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enable libdc1394_1; } ||
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