Remove bad and useless packages from LGTM build

It still fails due to CMake version being 3.13.4, but at
least we are not ones to blame now.

.lgtm.yml

@@ -6,8 +6,5 @@ extraction:
       packages:
       - "libsdl2-dev"
       - "qtmultimedia5-dev"
-      - "clang-format-10"
       - "libtbb-dev"
       - "libjack-jackd2-dev"
-      - "doxygen"
-      - "graphviz"