fix(CMakeLists.txt): disable check when compiling with emscripten
fix(CMakeLists.txt): disable check when compiling with emscripten

leodemoura/lean,leanprover-community/lean,johoelzl/lean,avigad/lean,fgdorais/lean,fgdorais/lean,johoelzl/lean,dselsam/lean,digama0/lean,Kha/lean,leanprover/lean,avigad/lean,dselsam/lean,avigad/lean,leanprover/lean,dselsam/lean,Kha/lean,leodemoura/lean,leodemoura/lean,rlewis1988/lean,rlewis1988/lean,Kha/lean,avigad/lean,leodemoura/lean,digama0/lean,fgdorais/lean,leodemoura/lean,leanprover/lean,fpvandoorn/lean,leanprover/lean,avigad/lean,leodemoura/lean,leanprover-community/lean,fgdorais/lean,fpvandoorn/lean,digama0/lean,rlewis1988/lean,digama0/lean,leanprover/lean,leanprover-community/lean,rlewis1988/lean,Kha/lean,fgdorais/lean,johoelzl/lean,fpvandoorn/lean,leanprover-community/lean,avigad/lean,dselsam/lean,dselsam/lean,digama0/lean,dselsam/lean,johoelzl/lean,leanprover-community/lean,digama0/lean,johoelzl/lean,leanprover/lean,fpvandoorn/lean,leanprover-community/lean,rlewis1988/lean,fgdorais/lean,Kha/lean,fpvandoorn/lean,rlewis1988/lean,fpvandoorn/lean,Kha/lean,johoelzl/lean