patch 8.2.2126: Ruby: missing function prototype

Problem:    Ruby: missing function prototype.
Solution:   Add the prototype.

Author: brammool

src/if_ruby.c

@@ -512,6 +512,10 @@ static void (*dll_rb_gc_writebarrier_unprotect)(VALUE obj);
 #  endif
 # endif
 
+# if RUBY_VERSION >= 26
+void rb_ary_detransient_stub(VALUE x);
+# endif
+
 # if (RUBY_VERSION >= 19) && !defined(PROTO)
 #  if RUBY_VERSION >= 22
     long

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2126,
 /**/
     2125,
 /**/