Revert "Explicitly chmod exec script files"

Library/Homebrew/extend/pathname.rb

@@ -328,12 +328,10 @@ class Pathname
     mkpath
     targets.each do |target|
       target = Pathname.new(target) # allow pathnames or strings
-      script = join(target.basename)
-      script.write <<~SH
+      join(target.basename).write <<~SH
         #!/bin/bash
         exec "#{target}" "$@"
       SH
-      script.chmod 0555
     end
   end
 
@@ -346,7 +344,6 @@ class Pathname
       #!/bin/bash
       #{env_export}exec "#{target}" "$@"
     SH
-    chmod 0555
   end
 
   # Writes a wrapper env script and moves all files to the dst
@@ -370,7 +367,6 @@ class Pathname
       #!/bin/bash
       #{java_home}exec java #{java_opts} -jar #{target_jar} "$@"
     SH
-    chmod 0555
   end
 
   def install_metafiles(from = Pathname.pwd)