swresample/x86/resample: Remove obsolete MMXEXT functions

x64 always has MMX, MMXEXT, SSE and SSE2 and this means
that some functions for MMX, MMXEXT, SSE and 3dnow are always
overridden by other functions (unless one e.g. explicitly
disables SSE2). So given that the only systems which benefit
from the MMXEXT resamplers (which are overridden by SSE2)
are truely ancient 32bit x86s they are removed.

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

libswresample/x86/resample.asm

@@ -594,11 +594,6 @@ INIT_XMM fma4
 RESAMPLE_FNS float, 4, 2, s, pf_1
 %endif
 
-%if ARCH_X86_32
-INIT_MMX mmxext
-RESAMPLE_FNS int16, 2, 1
-%endif
-
 INIT_XMM sse2
 RESAMPLE_FNS int16, 2, 1
 %if HAVE_XOP_EXTERNAL

libswresample/x86/resample_init.c

@@ -35,7 +35,6 @@ int ff_resample_common_##type##_##opt(ResampleContext *c, void *dst, \
 int ff_resample_linear_##type##_##opt(ResampleContext *c, void *dst, \
                                       const void *src, int sz, int upd)
 
-RESAMPLE_FUNCS(int16,  mmxext);
 RESAMPLE_FUNCS(int16,  sse2);
 RESAMPLE_FUNCS(int16,  xop);
 RESAMPLE_FUNCS(float,  sse);
@@ -52,10 +51,6 @@ av_cold void swri_resample_dsp_x86_init(ResampleContext *c)
 
     switch(c->format){
     case AV_SAMPLE_FMT_S16P:
-        if (ARCH_X86_32 && EXTERNAL_MMXEXT(mm_flags)) {
-            c->dsp.resample_linear = ff_resample_linear_int16_mmxext;
-            c->dsp.resample_common = ff_resample_common_int16_mmxext;
-        }
         if (EXTERNAL_SSE2(mm_flags)) {
             c->dsp.resample_linear = ff_resample_linear_int16_sse2;
             c->dsp.resample_common = ff_resample_common_int16_sse2;