ruby.h: NULL as empty array

* include/ruby/ruby.h (rb_yield_values, rb_funcall): call with
  NULL when no arguments, for clang which defines static array
  when an empty array is used.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59483 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

include/ruby/ruby.h

@@ -2456,7 +2456,7 @@ __extension__({ \
 	    (int)(sizeof(rb_yield_values_args) / sizeof(VALUE)); \
 	rb_yield_values2( \
 	    rb_varargs_argc_check(rb_yield_values_argc, rb_yield_values_nargs), \
-	    rb_yield_values_args); \
+	    rb_yield_values_nargs ? rb_yield_values_args : NULL); \
     })
 
 # define rb_funcall(recv, mid, argc, ...) \
@@ -2467,7 +2467,7 @@ __extension__({ \
 	    (int)(sizeof(rb_funcall_args) / sizeof(VALUE)); \
 	rb_funcallv(recv, mid, \
 	    rb_varargs_argc_check(rb_funcall_argc, rb_funcall_nargs), \
-	    rb_funcall_args); \
+	    rb_funcall_nargs ? rb_funcall_args : NULL); \
     })
 #endif