fix build errror with gcc

src/Base/FileInfo.cpp

@@ -176,7 +176,7 @@ std::string FileInfo::getTempFileName(const char* FileName, const char* Path)
     else
         std::strcat(buf, "/fileXXXXXX");
 
-    int id = (void) mkstemp(buf);
+    int id = mkstemp(buf);
     if (id > -1) {
         FILE* file = fdopen(id, "w");
         fclose(file);