swresample/x86/{audio_convert,rematrix}: Remove remnants of MMX

Forgotten in 2b94f23b06,
4e51e48ebd and
374b3ab03c.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libswresample/x86/audio_convert.asm

@@ -194,12 +194,7 @@ cglobal %2_to_%1_%3, 3, 3, 6, dst, src, len
     add lenq, 2*mmsize/(1<<%4)
 %endif
         jl .next
-%if mmsize == 8
-    emms
     RET
-%else
-    RET
-%endif
 %endmacro
 
 %macro PACK_6CH 8
@@ -284,12 +279,7 @@ pack_6ch_%2_to_%1_u_int %+ SUFFIX:
     add      dstq, mmsize*6
     sub      lend, mmsize/4
     jg .loop
-%if mmsize == 8
-    emms
     RET
-%else
-    RET
-%endif
 %endmacro
 
 %macro UNPACK_6CH 8

libswresample/x86/rematrix.asm

@@ -148,12 +148,7 @@ mix_1_1_int16_u_int %+ SUFFIX:
     mov%1  [outq + lenq + mmsize], m2
     add        lenq, mmsize*2
         jl .next
-%if mmsize == 8
-    emms
     RET
-%else
-    RET
-%endif
 %endmacro
 
 %macro MIX2_INT16 1
@@ -214,12 +209,7 @@ mix_2_1_int16_u_int %+ SUFFIX:
     mov%1  [outq + lenq + mmsize], m2
     add        lenq, mmsize*2
         jl .next
-%if mmsize == 8
-    emms
     RET
-%else
-    RET
-%endif
 %endmacro