package/liquid-dsp: fix x86 builds

HAVE_{MMX,SSE2,...} are not defined if ax_cv_have_{i}_cpu_ext is not set
resulting in the following build failure raised since bump to version
1.5.0 in commit c2aaa0fbe2fdf6e599c68169aa7b2e55237190c7 and
https://github.com/jgaeddert/liquid-dsp/commit/02c4e8b99b11d9f1615b8840f243b08a85b86563:

src/dotprod/src/dotprod_cccf.sse.c: In function 'dotprod_cccf_execute_sse':
src/dotprod/src/dotprod_cccf.sse.c:258:5: error: unknown type name '__m128'; did you mean '__int128'?
  258 |     __m128 v;   // input vector
      |     ^~~~~~
      |     __int128

or

src/dotprod/src/dotprod_cccf.mmx.c: In function 'dotprod_cccf_execute_mmx':
src/dotprod/src/dotprod_cccf.mmx.c:262:5: error: unknown type name '__m128'; did you mean '__int128'?
  262 |     __m128 v;   // input vector
      |     ^~~~~~
      |     __int128

While at it, add AVX2 support

Fixes:
 - http://autobuild.buildroot.org/results/738ce9d3dc74ec165391f21256c955e5524f1632
 - http://autobuild.buildroot.org/results/a2d150c724ab6787aeabaf31f65116f802e8584e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/liquid-dsp/liquid-dsp.mk

@@ -13,13 +13,23 @@ LIQUID_DSP_AUTORECONF = YES
 
 LIQUID_DSP_CONF_ENV = \
 	ax_cv_have_mmx_ext=$(if $(BR2_X86_CPU_HAS_MMX),yes,no) \
+	ax_cv_have_mmx_cpu_ext=$(if $(BR2_X86_CPU_HAS_MMX),yes,no) \
 	ax_cv_have_sse_ext=$(if $(BR2_X86_CPU_HAS_SSE),yes,no) \
+	ax_cv_have_sse_cpu_ext=$(if $(BR2_X86_CPU_HAS_SSE),yes,no) \
 	ax_cv_have_sse2_ext=$(if $(BR2_X86_CPU_HAS_SSE2),yes,no) \
+	ax_cv_have_sse2_cpu_ext=$(if $(BR2_X86_CPU_HAS_SSE2),yes,no) \
 	ax_cv_have_sse3_ext=$(if $(BR2_X86_CPU_HAS_SSE3),yes,no) \
+	ax_cv_have_sse3_cpu_ext=$(if $(BR2_X86_CPU_HAS_SSE3),yes,no) \
 	ax_cv_have_ssse3_ext=$(if $(BR2_X86_CPU_HAS_SSSE3),yes,no) \
+	ax_cv_have_ssse3_cpu_ext=$(if $(BR2_X86_CPU_HAS_SSSE3),yes,no) \
 	ax_cv_have_sse41_ext=$(if $(BR2_X86_CPU_HAS_SSE4),yes,no) \
+	ax_cv_have_sse41_cpu_ext=$(if $(BR2_X86_CPU_HAS_SSE4),yes,no) \
 	ax_cv_have_sse42_ext=$(if $(BR2_X86_CPU_HAS_SSE42),yes,no) \
-	ax_cv_have_avx_ext=$(if $(BR2_X86_CPU_HAS_AVX),yes,no)
+	ax_cv_have_sse42_cpu_ext=$(if $(BR2_X86_CPU_HAS_SSE42),yes,no) \
+	ax_cv_have_avx_ext=$(if $(BR2_X86_CPU_HAS_AVX),yes,no) \
+	ax_cv_have_avx_cpu_ext=$(if $(BR2_X86_CPU_HAS_AVX),yes,no) \
+	ax_cv_have_avx2_ext=$(if $(BR2_X86_CPU_HAS_AVX2),yes,no) \
+	ax_cv_have_avx2_cpu_ext=$(if $(BR2_X86_CPU_HAS_AVX2),yes,no)
 
 LIQUID_DSP_CFLAGS = $(TARGET_CFLAGS)
 LIQUID_DSP_LDFLAGS = $(TARGET_LDFLAGS)