Remove cppcheck arm64 job

All *:sid:amd64 jobs were errorneously copied to *:sid:arm64 including
the extra cppcheck run.  Remove the extra definitions from arm64 jobs.

.gitlab-ci.yml

@@ -745,10 +745,8 @@ unit:tarball:sid:amd64:
 gcc:sid:arm64:
   variables:
     CC: gcc
-    CFLAGS: "${CFLAGS_COMMON} -O3"
+    CFLAGS: "${CFLAGS_COMMON} -O2"
     EXTRA_CONFIGURE: "--enable-dnstap --with-libidn2"
-    RUN_MAKE_INSTALL: 1
-    MAKE: bear make
   <<: *debian_sid_arm64_image
   <<: *build_job
 
@@ -766,13 +764,6 @@ unit:gcc:sid:arm64:
     - job: gcc:sid:arm64
       artifacts: true
 
-cppcheck:gcc:sid:arm64:
-  <<: *debian_sid_arm64_image
-  <<: *cppcheck_job
-  needs:
-    - job: gcc:sid:arm64
-      artifacts: true
-
 # Jobs for regular GCC builds on Debian Sid (i386)
 
 gcc:sid:i386: