h264: use proper PROLOGUE statement for a function using 8 registers.

Fixes crashes when using biweight on win64.

libavcodec/x86/h264_weight_10bit.asm

@@ -160,7 +160,7 @@ DECLARE_REG_TMP 7
 
 %macro BIWEIGHT_PROLOGUE 0
 .prologue
-    PROLOGUE 0,7,8
+    PROLOGUE 0,8,8
     movifnidn  r0, r0mp
     movifnidn  r1, r1mp
     movifnidn r2d, r2m
@@ -218,7 +218,7 @@ DECLARE_REG_TMP 7
 %endmacro
 
 %macro BIWEIGHT_FUNC_DBL 1
-cglobal h264_biweight_16_10_%1, 0, 8, 8
+cglobal h264_biweight_16_10_%1
     BIWEIGHT_PROLOGUE
     BIWEIGHT_SETUP %1
 .nextrow
@@ -238,7 +238,7 @@ BIWEIGHT_FUNC_DBL sse2
 BIWEIGHT_FUNC_DBL sse4
 
 %macro BIWEIGHT_FUNC 1
-cglobal h264_biweight_8_10_%1, 0, 8, 8
+cglobal h264_biweight_8_10_%1
     BIWEIGHT_PROLOGUE
     BIWEIGHT_SETUP %1
 .nextrow
@@ -256,7 +256,7 @@ BIWEIGHT_FUNC sse2
 BIWEIGHT_FUNC sse4
 
 %macro BIWEIGHT_FUNC_HALF 1
-cglobal h264_biweight_4_10_%1, 0, 8, 8
+cglobal h264_biweight_4_10_%1
     BIWEIGHT_PROLOGUE
     BIWEIGHT_SETUP %1
     sar        r3d, 1