+x wrapper scripts, so they work during post-install

Library/Homebrew/extend/pathname.rb

@@ -377,6 +377,7 @@ class Pathname
     targets.flatten!
     if targets.empty?
       opoo "tried to write exec scripts to #{self} for an empty list of targets"
+      return
     end
     targets.each do |target|
       target = Pathname.new(target) # allow pathnames or strings
@@ -384,6 +385,8 @@ class Pathname
         #!/bin/bash
         exec "#{target}" "$@"
       EOS
+      # +x here so this will work during post-install as well
+      (self+target.basename()).chmod 0644
     end
   end
 
@@ -393,6 +396,8 @@ class Pathname
       #!/bin/bash
       exec java #{java_opts} -jar #{target_jar} "$@"
     EOS
+    # +x here so this will work during post-install as well
+    (self+script_name).chmod 0644
   end
 
   def install_metafiles from=nil