Ignore line markers from C preprocessing stage

tests/fuzz.py

@@ -138,6 +138,7 @@ def polish(src, inc_path):
         args = ["gcc",
                 "-I", inc_path,
                 "-E",
+                "-P",
                 "-",
         ]
         proc = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE)

tests/reduce-criteria-template.sh

@@ -18,7 +18,6 @@ if
   grep 'main-return-type' out.txt ||\
   grep 'conversions than data arguments' out.txt ||\
   grep 'int-conversion' out.txt ||\
-  grep 'incompatible redeclaration' out.txt ||\
   grep 'ordered comparison between pointer and zero' out.txt ||\
   grep 'ordered comparison between pointer and integer' out.txt ||\
   grep 'eliding middle term' out.txt ||\