hdrhistogram_c: apply patch (conditionally) to fix build on i686

pkgs/by-name/hd/hdrhistogram_c/no-avx2-i386.patch

@@ -0,0 +1,13 @@
+diff --git a/src/hdr_histogram.c b/src/hdr_histogram.c
+index b2041f8..a5dd8d7 100644
+--- a/src/hdr_histogram.c
++++ b/src/hdr_histogram.c
+@@ -36,7 +36,7 @@
+ 
+ /* Runtime-dispatched AVX2 path: keep the rest of this TU at the project's
+    baseline ISA so the shipped binary does not silently require AVX2. */
+-#if (defined(__x86_64__) || defined(_M_X64) || defined(__i386__) || defined(_M_IX86)) \
++#if (defined(__x86_64__) || defined(_M_X64)) \
+     && (defined(__GNUC__) || defined(__clang__)) && !defined(__INTEL_COMPILER)
+ #  define HDR_HAS_AVX2_DISPATCH 1
+ #  include <immintrin.h>

pkgs/by-name/hd/hdrhistogram_c/package.nix

@@ -20,6 +20,12 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-LMZj7vuxOA1bgU/J10IKnyNe3R0dk2AA1ydLTHun4vg=";
   };
 
+  # Fix build on i686 by not trying to build AVX2 code
+  # Submitted upstream: https://github.com/HdrHistogram/HdrHistogram_c/pull/143
+  ${if stdenv.hostPlatform.isi686 then "patches" else null} = [
+    ./no-avx2-i386.patch
+  ];
+
   buildInputs = [ zlib ];
   nativeBuildInputs = [
     cmake