Moving `#include taintdag/labels.h` cases syntax errors

[surovic]

Moving #include taintdag/labels.h in here like

#include <catch2/catch.hpp>

#include "taintdag/outputfile.h"
#include "taintdag/section.h"
#include "taintdag/storage.h"
#include "taintdag/string_table.h"
#include "taintdag/taint_source.h"
#include "taintdag/labels.h"

to

#include <catch2/catch.hpp>

#include "taintdag/labels.h"
#include "taintdag/outputfile.h"
#include "taintdag/section.h"
#include "taintdag/storage.h"
#include "taintdag/string_table.h"
#include "taintdag/taint_source.h"

causes syntax errors. Maybe due missing dependencies in taintdag/labels.h ?