Get rid of \K for old BASERUBYs which have a bug in String#scan

tool/leaked-globals

@@ -17,7 +17,7 @@ config = ARGV.shift
 count = 0
 col = Colorize.new
 config_code = File.read(config)
-REPLACE = config_code.scan(/\bAC_(?:REPLACE|CHECK)_FUNCS?\(\K\w+/)
+REPLACE = config_code.scan(/\bAC_(?:REPLACE|CHECK)_FUNCS?\((\w+)/).flatten
 REPLACE << 'memcmp' if /\bAC_FUNC_MEMCMP\b/ =~ config_code
 REPLACE.push('main', 'DllMain')
 print "Checking leaked global symbols..."