enc-unicode.rb: for gperf 3.1

* tool/enc-unicode.rb: support for gperf 3.1, which defines length
  arguments as `size_t` but a local variable as `unsigned int`.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/enc-unicode.rb

@@ -539,6 +539,7 @@ if header
       f.each {|line|
         line.gsub!(/\(int\)\((?:long|size_t)\)&\(\(struct uniname2ctype_pool_t \*\)0\)->uniname2ctype_pool_(str\d+),\s+/,
                    'uniname2ctype_offset(\1), ')
+        line.sub!(/^(uniname2ctype_(hash|p) *\(.* )size_t /, '\1unsigned int ')
         puts line
       }
     }