Use macros for RSTRING length and ptr.  Fixes compilation under Ruby 1.9.
Use macros for RSTRING length and ptr.  Fixes compilation under Ruby 1.9.

regit/libhtp,glongo/libhtp,montekki/libhtp,wxsBSD/libhtp,montekki/libhtp,montekki/libhtp,wxsBSD/libhtp,glongo/libhtp,montekki/libhtp,regit/libhtp,wxsBSD/libhtp,glongo/libhtp,montekki/libhtp,glongo/libhtp,OISF/libhtp,OISF/libhtp,regit/libhtp,glongo/libhtp,glongo/libhtp,OISF/libhtp,OISF/libhtp,OISF/libhtp,glongo/libhtp,montekki/libhtp,wxsBSD/libhtp,wxsBSD/libhtp,OISF/libhtp,wxsBSD/libhtp,wxsBSD/libhtp,OISF/libhtp,regit/libhtp,regit/libhtp,montekki/libhtp