Try dropping const qualifier to suppress msiwn warning

https://ci.appveyor.com/project/ruby/ruby/builds/23995093/job/qo728n1uorepkx16

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67665 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

mjit_compile.c

@@ -48,7 +48,7 @@ struct compile_status {
     // Mutated optimization levels
     struct rb_mjit_compile_info *compile_info;
     // If `inlined_iseqs[pos]` is not NULL, `mjit_compile_body` tries to inline ISeq there.
-    const struct rb_iseq_constant_body **inlined_iseqs;
+    struct rb_iseq_constant_body **inlined_iseqs;
     struct inlined_call_context inline_context;
 };