Upgrade libsoxr to 0.1.3

lib-src/libsoxr/cmake/Modules/FindSIMD64.cmake

@@ -0,0 +1,29 @@
+# SoX Resampler Library       Copyright (c) 2007-16 robs@users.sourceforge.net
+# Licence for this file: LGPL v2.1                  See LICENCE for details.
+
+# - Finds SIMD64 support
+#
+# The following variables are set:
+#   SIMD64_C_FLAGS - flags to add to the C compiler for this package.
+#   SIMD64_FOUND - true if support for this package is found.
+
+if (DEFINED SIMD64_C_FLAGS OR CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")
+  set (TRIAL_C_FLAGS)
+else ()
+  set (TRIAL_C_FLAGS
+    "-mavx" # Gcc
+    "/arch:AVX" # MSVC
+  )
+  set (TEST_C_SOURCE "
+    #ifndef __AVX__
+      #error
+    #endif
+    #include <immintrin.h>
+    int main() {return 0;}
+    ")
+endif ()
+
+include (FindCFlags)
+
+FindCFlags ("SIMD64" "FLOAT-64 (double-precision) SIMD vectorization"
+  "${TRIAL_C_FLAGS}" "${TEST_C_SOURCE}")