chore: change the parameter used for 'find' in link-all.sh (#13510)

The parameter currently used for `find` in `link-all.sh`,
`-perm /111`, fails on my Mac.
Switch to using `-perm +111`, which works fine,
and that's also what JSII uses in
[its `link-all.sh` script](https://github.com/aws/jsii/blob/f8bde4a01bf7c707c87ab00748eeeb7632e7c820/scripts/link-all.sh#L26-L26).

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link-all.sh

@@ -26,7 +26,7 @@ for module in ${modules}; do
   # according to spec (we look in the bin/ directory instead of the { "scripts"
   # } entry in package.json but it's quite a bit easier.
   if [[ -d $module/bin ]]; then
-    for script in $(find $module/bin -perm /111); do
+    for script in $(find $module/bin -perm +111); do
       echo "${script} => node_modules/.bin/$(basename $script)"
       ln -fs ${script} node_modules/.bin
     done