[libopenshot/f32] (4 commits) ...Fix gcc-10 -fno-common issue
Summary of changes:
4134dea... Rebuild for ImageMagick on el7 (*)
2406e1e... Rebuild for python-3.9 (*)
8ad7d4b... add define for legacy_common_support (*)
4a61f1c... Fix gcc-10 -fno-common issue (*)
(*) This commit already existed in another branch; no separate mail sent