loader, hello_xr: case fixes in includes

Author: rpavlik

src/loader/loader_logger_recorders.cpp

@@ -33,7 +33,7 @@
 #include <sstream>
 
 #ifdef _WIN32
-#include <Windows.h>
+#include <windows.h>
 #endif
 
 // Anonymous namespace to keep these types private

src/tests/hello_xr/pch.h

@@ -81,7 +81,7 @@
 #endif
 #ifdef XR_USE_PLATFORM_WIN32
 #include <wingdi.h>  // For HGLRC
-#include <gl/GL.h>
+#include <GL/gl.h>
 #endif
 #endif