OGL: Work around slowdown of glMapBufferRange with SSBO on NVIDIA drivers

Using glMapBufferRange to read back the contents of the SSBO is extremely
slow on NVIDIA drivers. This is more noticeable at higher internal
resolutions. Using glGetBufferSubData instead does not seem to exhibit
this slowdown.

Source/Core/VideoCommon/DriverDetails.cpp

@@ -60,6 +60,7 @@ namespace DriverDetails
 		{OS_WINDOWS,VENDOR_NVIDIA,   DRIVER_NVIDIA,   Family::UNKNOWN, BUG_BROKENUNSYNCMAPPING, -1.0, -1.0, true},
 		{OS_LINUX,  VENDOR_NVIDIA,   DRIVER_NVIDIA,   Family::UNKNOWN, BUG_BROKENUNSYNCMAPPING, -1.0, -1.0, true},
 		{OS_WINDOWS,VENDOR_INTEL,    DRIVER_INTEL,    Family::UNKNOWN, BUG_INTELBROKENBUFFERSTORAGE, 101810.3907, 101810.3960, true},
+		{OS_ALL,    VENDOR_ATI,      DRIVER_ATI,      Family::UNKNOWN, BUG_SLOWGETBUFFERSUBDATA, -1.0, -1.0, true},
 	};
 
 	static std::map<Bug, BugInfo> m_bugs;