Arm backend: Exclude build metadata from license checks

Treat BUCK and TARGETS files as build metadata in the Arm
pre-push license check so they do not need copyright headers.

Signed-off-by: Per Held <per.held@arm.com>
Change-Id: I4b3bbd1e03ba4b9c38fd06225156344985f0cc70

Author: perheld

backends/arm/scripts/pre-push

@@ -177,7 +177,7 @@ for COMMIT in ${COMMITS}; do
     for committed_file in "${license_files[@]}"; do
         # Skip files with certain extensions
         case "$committed_file" in
-            *.md|*.md.in|*.json|*.yml|*.yaml|*.cmake|*.patch|.gitignore|*.bzl)
+            *.md|*.md.in|*.json|*.yml|*.yaml|*.cmake|*.patch|.gitignore|*.bzl|BUCK|*/BUCK|TARGETS|*/TARGETS)
                 echo -e "${INFO} Skipping license check for ${committed_file} (excluded extension)"
                 continue
                 ;;