Request AMD GPU on Enduro Devices

It seems AMD provides an equivalent to `NvOptimusEnablement` called `AmdPowerXpressRequestHighPerformance`

See https://gpuopen.com/learn/amdpowerxpressrequesthighperformance/

src/graphics/glwrap.cpp

@@ -693,9 +693,10 @@ bool checkGLError()
 }
 
 #ifdef WIN32
-// Tell system that it should use nvidia on optimus devices
+// Tell system that it should use nvidia on optimus devices and amd on enduro devices
 extern "C" {
     __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
+    __declspec(dllexport) DWORD AmdPowerXpressRequestHighPerformance = 0x00000001;
 }
 #endif