Fixed compiler warnings

sql/rpl_mi.cc:
  Fixed compiler warning
support-files/compiler_warnings.supp:
  Supress warning about offsetof macro. (ok in this case)

sql/rpl_mi.cc

@@ -666,7 +666,8 @@ void create_logfile_name_with_suffix(char *res_file_name, uint length,
     length-= (suffix->length - ext_pos); /* Leave place for extension */
     p= res_file_name + ext_pos;
     *p++= '-';                           /* Add separator */
-    p= strmake(p, res, min(length - (p - res_file_name), res_length));
+    p= strmake(p, res, min((size_t) (length - (p - res_file_name)),
+                           res_length));
     /* Add back extension. We have checked above that there is space for it */
     strmov(p, ext);
   }

support-files/compiler_warnings.supp

@@ -193,6 +193,8 @@ ma_packrec\.c : .*result of 32-bit shift implicitly converted to 64 bits.* : 550
 #
 .* : .*no matching operator delete found; memory will not be freed if initialization throws an exception.*
 ctype-simple\.c : .*unary minus operator applied to unsigned type, result still unsigned.*
+sql/sys_vars\.cc : invalid access to non-static data member
+sql/sys_vars\.cc : perhaps the 'offsetof' macro was used incorrectly
 
 # Wrong warning due to GCC bug: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29478
 regexec\.c : passing argument 3 of.*matcher.* discards qualifiers from pointer target type