Add volatile to a suppress warning.

Without the fix, the following warning is shown:

    compiling cont.c
    cont.c: In function ‘rb_callcc’:
    cont.c:949:39: warning: passing argument 1 of ‘cont_capture’ discards ‘volatile’ qualifier from pointer target type [-Wdiscarded-qualifiers]
	 volatile VALUE val = cont_capture(&called);
					   ^
    cont.c:473:1: note: expected ‘int * volatile’ but argument is of type ‘volatile int *’
     cont_capture(int *volatile stat)
     ^

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57021 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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