drop unused valgrind package from installation
drop unused valgrind package from installation

... and remove explicit gcc installation (will be installed with g++
automatically)

fuchsia-mirror/third_party-googletest,antidotcb/googletest,xnagireddy/googletest,jlanecox/googletest,xnagireddy/googletest,antidotcb/googletest,fuchsia-mirror/third_party-googletest,fuchsia-mirror/third_party-googletest,empiredan/googletest,google/googletest,jlanecox/googletest,google/googletest,google/googletest,xnagireddy/googletest,xnagireddy/googletest,empiredan/googletest,antidotcb/googletest,gianricardo/googletest,google/googletest,empiredan/googletest,jlanecox/googletest,gianricardo/googletest,fuchsia-mirror/third_party-googletest,gianricardo/googletest,antidotcb/googletest,jlanecox/googletest