Adds icu script. Makes use of local variables.

.rc.d/icu.sh

@@ -0,0 +1,11 @@
+function {
+  local icu_path=/opt/homebrew/opt/icu4c
+  local bin_path=$icu_path/bin
+  local sbin_path=$icu_path/sbin
+  if [ -d bin_path ]; then
+    path=($bin_path $path)
+  fi
+  if [ -d $sbin_path ]; then
+    path=($sbin_path $path)
+  fi
+}