Patch to make the levenshtein gem ruby 1.9 compatible

makes_levenshtein gem_ruby_1.9_compatible.diff

3,9d2
< /* Ruby 1.8 compatibility macros, these are defined in Ruby 1.9 
<    so the ones below will only be used in 1.8.x */
< #ifndef RSTRING_PTR
< # define RSTRING_PTR(s) (RSTRING(s)->ptr)
< # define RSTRING_LEN(s) (RSTRING(s)->len)
< #endif
< 
22,23c15,16
<   s1	= RSTRING_PTR(rb_s1);
<   l1	= RSTRING_LEN(rb_s1);
---
>   s1	= RSTRING(rb_s1)->ptr;
>   l1	= RSTRING(rb_s1)->len;
28,29c21,22
<   s2	= RSTRING_PTR(rb_s2);
<   l2	= RSTRING_LEN(rb_s2);
---
>   s2	= RSTRING(rb_s2)->ptr;
>   l2	= RSTRING(rb_s2)->len;