musl: include libc.musl-$arch

pkgs/os-specific/linux/musl/default.nix

@@ -26,6 +26,12 @@ let
     sha256 = "1mzxnc2ncq8lw9x6n7p00fvfklc9p3wfv28m68j0dfz5l8q2k6pp";
   };
 
+  arch = if stdenv.hostPlatform.isx86_64
+    then "x86_64"
+    else if stdenv.hostPlatform.isx86_32
+      then "i386"
+      else null;
+
 in
 stdenv.mkDerivation rec {
   pname = "musl";
@@ -102,6 +108,9 @@ stdenv.mkDerivation rec {
       -lc \
       -B $out/lib \
       -Wl,-dynamic-linker=$(ls $out/lib/ld-*)
+  '' + lib.optionalString (arch != null) ''
+    # Create 'libc.musl-$arch' symlink
+    ln -rs $out/lib/libc.so $out/lib/libc.musl-${arch}.so.1
   '' + lib.optionalString useBSDCompatHeaders ''
     install -D ${queue_h} $dev/include/sys/queue.h
     install -D ${cdefs_h} $dev/include/sys/cdefs.h