Merge pull request #2855 from cstrahan/xpwn-fix-darwin

Fix xpwn on Darwin and other case-insensitive file systems

pkgs/development/mobile/xpwn/default.nix

···
   };
 
   preConfigure = ''
+    rm BUILD # otherwise `mkdir build` fails on case insensitive file systems
     sed -r -i \
       -e 's/(install.*TARGET.*DESTINATION )\.\)/\1bin)/' \
       -e 's!(install.*(FILE|DIR).*DESTINATION )([^)]*)!\1share/xpwn/\3!' \