decrease the number of macros tested by cppcheck

src/maketools/codecheck

@@ -34,11 +34,14 @@ if [ $do_cppcheck == true ] ; then
   else
     files="$(echo */*.{h,cpp})"
   fi
+  # we discard configurations introduced in small_vector because they are many and
+  # get included in many files
   cppcheck --std=c++17 -j 4 --platform=unix64 --language=c++ \
   -U__GNUG__ -U__PLUMED_HAS_EXTERNAL_LAPACK -U__PLUMED_HAS_EXTERNAL_BLAS \
   -UGMX_CYGWIN  -UF77_NO_UNDERSCORE -U_GLIBCXX_DEBUG -DNDEBUG -U__PLUMED_PBC_WHILE  \
   -U__PLUMED_HAS_ASMJIT \
   -D__PLUMED_WRAPPER_CXX_EXPLICIT=explicit \
+  --config-exclude=small_vector/ \
   --template='[{file}:{line}] ({severity}) :{id}: {message}' --enable=all --suppress=missingIncludeSystem --inline-suppr --force \
   $files
 fi