Only add DFN to search path if not a subdir of the other path

code/nel/tools/sound/build_sound/build_sound.cpp

@@ -103,6 +103,8 @@ int main(int nNbArg, char **ppArgs)
 	
 	// add search paths
 	CPath::addSearchPath(leveldesignDir, true, false);
+	std::string relativeDfnDir = dfnDir; // only add dfn if not a subdir of leveldesignDir
+	if (!CPath::makePathRelative(leveldesignDir, dfnDir) || relativeDfnDir.size() < 2 || (relativeDfnDir[0] == '.' && relativeDfnDir[1] == '.'))
 		CPath::addSearchPath(dfnDir, true, false);
 
 	// create the audio mixer

code/nel/tools/sound/build_soundbank/build_soundbank.cpp

@@ -82,6 +82,8 @@ int main(int nNbArg, char **ppArgs)
 	
 	// add search paths
 	CPath::addSearchPath(leveldesignDir, true, false);
+	std::string relativeDfnDir = dfnDir; // only add dfn if not a subdir of leveldesignDir
+	if (!CPath::makePathRelative(leveldesignDir, dfnDir) || relativeDfnDir.size() < 2 || (relativeDfnDir[0] == '.' && relativeDfnDir[1] == '.'))
 		CPath::addSearchPath(dfnDir, true, false);
 
 	// build the sound bank