ci: disable frames in lcov HTML coverage report

Change-Id: I5dea51551f8011277d49ce78c80d9064580399a1
diff --git a/.jenkins.d/00-deps.sh b/.jenkins.d/00-deps.sh
index 742fa8b..05ad5d1 100755
--- a/.jenkins.d/00-deps.sh
+++ b/.jenkins.d/00-deps.sh
@@ -30,7 +30,7 @@
                              libpcap-dev libsystemd-dev
 
     if [[ $JOB_NAME == *"code-coverage" ]]; then
-        sudo apt-get -qy install gcovr lcov libgd-perl
+        sudo apt-get -qy install gcovr lcov
     fi
 
 elif has CentOS-8 $NODE_LABELS; then
diff --git a/.jenkins.d/30-coverage.sh b/.jenkins.d/30-coverage.sh
index 380366e..6a8ad44 100755
--- a/.jenkins.d/30-coverage.sh
+++ b/.jenkins.d/30-coverage.sh
@@ -28,7 +28,6 @@
 
     genhtml --branch-coverage \
             --demangle-cpp \
-            --frames \
             --legend \
             --output-directory build/coverage \
             --title "NFD unit tests" \