Make cppcheck print diagnostics only (#2456)

The progress messages of cppcheck produce a lengthy and verbose
log, making errors and warnings hard to find. This patch adds
`--quiet` to the invocation of `cppcheck`

Additionally, the patch relayouts the script to use a consistent
two-spaces indentation everywhere.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

tools/check-cppcheck.sh

@@ -37,6 +37,7 @@ done
 
 cppcheck -j$CPPCHECK_JOBS --force \
   --language=c --std=c99 \
+  --quiet \
   --enable=warning,style,performance,portability,information \
   --template="{file}:{line}: {severity}({id}): {message}" \
   --error-exitcode=1 \