Fortify against space in ffoo install path

like if someone's ever going to do it, right...?
("C:\Program Files\fastfoo" ... ugh...)

bin/mkexec

         test    => "use strict;\nuse warnings;\nuse Test::More;\n\n",
     },
     bash => {
-        'ffoo'  => "\n. \$(ffoom path) || exit 3\n\n"
+        'ffoo'  => "\n. \"\$(ffoom path)\" || exit 3\n\n"
                    . "ffoo import pretty\n\n"
                    . "FFOO_DEBUG=true",
     }