get rid of macros

src/gpu.cpp

@@ -9,6 +9,9 @@
 
 namespace gpu {
 
+const std::string rel_metrics_path = "/../../gpu_metrics";  // gpu_metrics path relative to hwmon path
+constexpr uint16_t max_metrics_length = 512;                 // length of the metrics buffer
+
 /* takes pointer to a target gpu::sensors struct and updates its hwmon path and detects gpu_metrics */
 void detectHwmon(gpuSensors* target, const std::string& pci) {
     target->hwmon = utils::getFirstDir("/sys/bus/pci/devices/" + pci + "/hwmon");