message: fix complaints about _IRR_DEBUG
diff: @@ -177,7 +177,7 @@ void COpenGLSLMaterialRenderer::init(int32_t& outMaterialTypeNr,
  pr.length = length;
  pr.type = getIrrUniformType(type);
  constants.push_back(pr);
  -#if _IRR_DEBUG
  +#ifdef _IRR_DEBUG
  debugConstantIndices.push_back(i);
  #endif
  }
  @@ -194,7 +194,7 @@ void COpenGLSLMaterialRenderer::init(int32_t& outMaterialTypeNr,
  COpenGLExtensionHandler::extGlUseProgram(oldProgram);
  }
  -#if _IRR_DEBUG
  +#ifdef _IRR_DEBUG
  debugConstants = constants;
  #endif
  }
  