removed valgrind (had a problem in ubuntu 20.04)

gcontini

2021-05-20 54d1f4ec3b0e212481b711bac3d1dd5c67afe274

 test/functional/CMakeLists.txt

@@ -40,7 +40,6 @@
 test_signature_verifier
 licensecc_static
 license_generator_snippet
 ${EXTERNAL_LIBS}
 Boost::unit_test_framework 
 Boost::filesystem
 Boost::system