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win64: Use rsp instead of esp

Using esp works by coincidence as long as the stack pointer is
within the first 4 GB of the address space - which seems to work
as long as the test binary is built with /dynamicbase:no, but breaks
if this option is removed.

--- a/codec/common/deblock.asm

+++ b/codec/common/deblock.asm

@@ -64,7 +64,7 @@

 DeblockLumaLt4V_sse2:

   push        rbp      

-  mov         r11,[esp + 16 + 20h]  ; pTC                                                    

+  mov         r11,[rsp + 16 + 20h]  ; pTC

   sub         rsp,1B0h                                                       

   lea         rbp,[rsp+20h]                                                  

   movd        xmm4,r8d