Update ADL SDK URL.

ADL_SDK/readme.txt

@@ -1,2 +1,3 @@
 Please insert AMD ADL files adl_defines.h adl_sdk.h adl_structures.h here.
-(http://developer.amd.com/gpu/adlsdk/Pages/default.aspx)
+They can be found here:
+http://developer.amd.com/sdks/ADLSDK/Pages/default.aspx