travis/gitlab/azure: Run cppcheck in parallel

This takes ages to run single-threaded. Adjust it to use all available
processors.

Signed-off-by: Simon Glass <sjg@chromium.org>

.azure-pipelines.yml

@@ -52,7 +52,7 @@ jobs:
       image: $(ci_runner_image)
       options: $(container_option)
     steps:
-      - script: cppcheck --force --quiet --inline-suppr .
+      - script: cppcheck -j$(nproc) --force --quiet --inline-suppr .
 
   - job: htmldocs
     displayName: 'Build HTML documentation'

.gitlab-ci.yml

@@ -103,7 +103,7 @@ cppcheck:
   tags: [ 'all' ]
   stage: testsuites
   script:
-    - cppcheck --force --quiet --inline-suppr .
+    - cppcheck -j$(nproc) --force --quiet --inline-suppr .
 
 # search for TODO within source tree
 grep TODO/FIXME/HACK:

.travis.yml

@@ -448,7 +448,7 @@ matrix:
     # static code analysis with cppcheck (we can add --enable=all later)
     - name: "cppcheck"
       script:
-        - cppcheck --force --quiet --inline-suppr .
+        - cppcheck -j$(nproc) --force --quiet --inline-suppr .
     # build HTML documentation
     - name: "htmldocs"
       script: