androidenv: fix darwin ndk symlink

Today the nix ndk package on darwin points to a directory that doesn't
exist. This fix was added previously for linux but is needed on all
platforms.

pkgs/development/mobile/androidenv/ndk-bundle/default.nix

@@ -13,7 +13,7 @@ deployAndroidPackage {
     ++ lib.optionals stdenv.isLinux [ autoPatchelfHook ];
   autoPatchelfIgnoreMissingDeps = true;
   buildInputs = lib.optionals (os == "linux") [ pkgs.zlib ];
-  patchInstructions = lib.optionalString (os == "linux") (''
+  patchInstructions = ''
     patchShebangs .
 
     # TODO: allow this stuff
@@ -37,9 +37,11 @@ deployAndroidPackage {
         addAutoPatchelfSearchPath $out/libexec/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/lib64
     fi
 
-    find toolchains -type d -name bin -or -name lib64 | while read dir; do
-        autoPatchelf "$dir"
-    done
+    if [ -d toolchains/llvm/prebuilt/linux-x86_64 ]; then
+        find toolchains/llvm/prebuilt/linux-x86_64 -type d -name bin -or -name lib64 | while read dir; do
+            autoPatchelf "$dir"
+        done
+    fi
 
     # fix ineffective PROGDIR / MYNDKDIR determination
     for progname in ndk-build; do
@@ -47,7 +49,9 @@ deployAndroidPackage {
     done
 
     # Patch executables
-    autoPatchelf prebuilt/linux-x86_64
+    if [ -d prebuild/linux-x86_64 ]; then
+        autoPatchelf prebuilt/linux-x86_64
+    fi
 
     # wrap
     for progname in ndk-build; do
@@ -59,6 +63,6 @@ deployAndroidPackage {
     for progname in ndk-build; do
         ln -sf ../libexec/android-sdk/ndk-bundle/$progname $out/bin/$progname
     done
-  '');
+  '';
   noAuditTmpdir = true; # Audit script gets invoked by the build/ component in the path for the make standalone script
 }