warning: ‘OperatorStrings’ defined but not used

[kenorb]

CI Job ID: #339849087 (line 583 and so on)

../src/../include/nodes/OperatorTreeNode.h:7:21: warning: ‘OperatorStrings’ defined but not used [-Wunused-variable]
 static const char * OperatorStrings[] = { "And", "Or", "Xor"};
                     ^
In file included from ../src/BinaryTreeChromosome.cpp:5:0:
../src/../include/nodes/IndicatorTreeNode.h:5:21: warning: ‘SignStrings’ defined but not used [-Wunused-variable]
 static const char * SignStrings[] = { ">", "<" };
                     ^
In file included from ../src/nodes/TreeNode.cpp:4:0:
../src/nodes/../../include/nodes/OperatorTreeNode.h:7:21: warning: ‘OperatorStrings’ defined but not used [-Wunused-variable]
 static const char * OperatorStrings[] = { "And", "Or", "Xor"};
                     ^
In file included from ../src/nodes/TreeNode.cpp:5:0:
../src/nodes/../../include/nodes/IndicatorTreeNode.h:5:21: warning: ‘SignStrings’ defined but not used [-Wunused-variable]
 static const char * SignStrings[] = { ">", "<" };
                     ^