[CI] Use Clang 10 (#1131)
[CI] Use Clang 10 (#1131)

See <https://github.com/koreader/virdevenv/pull/52>.
koreader/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,koreader/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,koreader/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base