SPLighting.frag: fix syntax error with vertex lighting enabled

jme3-core/src/main/resources/Common/MatDefs/Light/SPLighting.frag

@@ -72,7 +72,8 @@ uniform float m_Shininess;
 #endif
 
 void main(){
-    #ifdef NORMALMAP   
+    #if !defined(VERTEX_LIGHTING)
+        #if defined(NORMALMAP)
             mat3 tbnMat = mat3(normalize(vTangent.xyz) , normalize(vBinormal.xyz) , normalize(vNormal.xyz));
 
             if (!gl_FrontFacing)
@@ -84,6 +85,7 @@ void main(){
         #else
             vec3 viewDir = normalize(-vPos.xyz);
         #endif
+    #endif
 
     vec2 newTexCoord;