Merge pull request #16 from github/2.1+RSTRING_HTML_SAFE

Reserve the FL_USER18 bit for RSTRING_HTML_SAFE

Author: Charlie Somerville

include/ruby/ruby.h

@@ -833,6 +833,7 @@ struct RString {
 };
 #define RSTRING_NOEMBED FL_USER1
 #define RSTRING_FSTR FL_USER17
+#define RSTRING_HTML_SAFE FL_USER18
 #define RSTRING_EMBED_LEN_MASK (FL_USER2|FL_USER3|FL_USER4|FL_USER5|FL_USER6)
 #define RSTRING_EMBED_LEN_SHIFT (FL_USHIFT+2)
 #define RSTRING_EMBED_LEN(str) \