Sort bin/find-unneeded-includes results

not naturally, but numerically
so a hit in line 101 will be listed after the hit in line 99
not after the one in line 10

Change-Id: Ic5b3da80df20a3aeda7b1a71c8d6380371ed3ee8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/179320
Reviewed-by: Gabor Kelemen <gabor.kelemen.extern@allotropia.de>
Tested-by: Jenkins

bin/find-unneeded-includes

@@ -410,10 +410,10 @@ def processIWYUOutput(iwyuOutput, moduleRules, fileName, noexclude, checknamespa
                     subprocess.run(["git", "grep", "-n", "namespace.*[^a-zA-Z]"+nameSpace+" *;", fileName])
 
     if removefwdd:
-        for remove in sorted(toRemove):
+        for remove in sorted(toRemove, key=lambda x: int(x.split(":")[1])):
             print("ERROR: %s: remove not needed forward declaration" % remove)
     else:
-        for remove in sorted(toRemove):
+        for remove in sorted(toRemove, key=lambda x: int(x.split(":")[1])):
             print("ERROR: %s: remove not needed include" % remove)
     return len(toRemove)