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Fix thumbnailer fails due to OpenBLAS pthread exceeding address space limit

Alban Browaeys requested to merge prahal/totem:fix-openblas-threads-exceed-addresspace into debian/latest

OpenBLAS statically allocates buffers based on the number of max threads itself depending on the number of cores at runtime. This exceeds the address space limit due to totem video thumbnailer setting RLIMIT_DATA (the max address space size) to 512MB plus the video file size.

Set OMP_NUM_THREADS to 1 in totem-video-thumbnailer to workaround this.

Fixes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=967941

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