removed valgrind (had a problem in ubuntu 20.04)

gcontini

2021-05-20 54d1f4ec3b0e212481b711bac3d1dd5c67afe274

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[submodule "license-generator"]
    path = extern/license-generator
    url = https://github.com/open-license-manager/lcc-license-generator.git
    branch = develop