treewide: rename llvm-dsymutil to dsymutil

This is a change introduced between llvm 5 and llvm 7.

pkgs/development/compilers/go/1.10.nix

@@ -131,11 +131,6 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  postPatch = optionalString stdenv.isDarwin ''
-    echo "substitute hardcoded dsymutil with ${llvm}/bin/llvm-dsymutil"
-    substituteInPlace "src/cmd/link/internal/ld/lib.go" --replace dsymutil ${llvm}/bin/llvm-dsymutil
-  '';
-
   GOOS = if stdenv.isDarwin then "darwin" else "linux";
   GOARCH = if stdenv.isDarwin then "amd64"
            else if stdenv.hostPlatform.system == "i686-linux" then "386"

pkgs/development/compilers/go/1.11.nix

@@ -136,11 +136,6 @@ stdenv.mkDerivation rec {
     ./skip-test-extra-files-on-386.patch
   ];
 
-  postPatch = optionalString stdenv.isDarwin ''
-    echo "substitute hardcoded dsymutil with ${llvm}/bin/llvm-dsymutil"
-    substituteInPlace "src/cmd/link/internal/ld/lib.go" --replace dsymutil ${llvm}/bin/llvm-dsymutil
-  '';
-
   GOOS = stdenv.targetPlatform.parsed.kernel.name;
   GOARCH = goarch stdenv.targetPlatform;
   # GOHOSTOS/GOHOSTARCH must match the building system, not the host system.

pkgs/development/tools/analysis/valgrind/default.nix

@@ -44,14 +44,8 @@ stdenv.mkDerivation rec {
       substituteInPlace coregrind/Makefile.in \
          --replace /usr/include/mach ${xnu}/include/mach
 
-      echo "substitute hardcoded dsymutil with ${llvm}/bin/llvm-dsymutil"
-      find -name "Makefile.in" | while read file; do
-         substituteInPlace "$file" \
-           --replace dsymutil ${llvm}/bin/llvm-dsymutil
-      done
-
       substituteInPlace coregrind/m_debuginfo/readmacho.c \
-         --replace /usr/bin/dsymutil ${llvm}/bin/llvm-dsymutil
+         --replace /usr/bin/dsymutil ${stdenv.cc.bintools.bintools}/bin/dsymutil
 
       echo "substitute hardcoded /usr/bin/ld with ${cctools}/bin/ld"
       substituteInPlace coregrind/link_tool_exe_darwin.in \

pkgs/os-specific/darwin/binutils/default.nix

@@ -35,7 +35,7 @@ stdenv.mkDerivation {
       ln -sf "${cctools}/bin/$i" "$out/bin/$i"
     done
 
-    ln -s ${llvm}/bin/llvm-dsymutil $out/bin/dsymutil
+    ln -s ${llvm}/bin/dsymutil $out/bin/dsymutil
 
     ln -s ${binutils-unwrapped.out}/share $out/share