TLS memory leak in libGLESv2

Thread-local storage allocated by "TppWorkerThread" threads in the AllocateCurrent function in libGLESv2.dll are not destroyed on program termination. The reason for this is that DllMain(DLL_THREAD_DETACH) is never called for the worker threads.

Leaking call stack for a minimal Qt application that loads libGLESv2.dll:

• libGLESv2d.dll!`anonymous namespace'::AllocateCurrent() Line 49 C++
• libGLESv2d.dll!DllMain(HINSTANCE__ * __formal=0x00850000, unsigned long reason=2, void * __formal=0x00000000) Line 96 C++
• libGLESv2d.dll!__DllMainCRTStartup(void * hDllHandle=0x00850000, unsigned long dwReason=2, void * lpreserved=0x00000000) Line 508 C
• libGLESv2d.dll!_DllMainCRTStartup(void * hDllHandle=0x00850000, unsigned long dwReason=2, void * lpreserved=0x00000000) Line 472 C

Instructions for how to get a leak listing & break on leaking allocations: https://msdn.microsoft.com/en-us/library/x98tx3cf.aspx

I'm not sure if this is a Qt or ANGLE issue, but regardless of reason it affects Qt applications.