* include/ruby/win32.h (GetCurrentThreadHandle): remove unused API.

follow r33881.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33889 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

include/ruby/win32.h

@@ -596,7 +596,6 @@ struct tms {
 int rb_w32_times(struct tms *);
 
 /* thread stuff */
-HANDLE GetCurrentThreadHandle(void);
 int  rb_w32_sleep(unsigned long msec);
 int  rb_w32_putc(int, FILE*);
 int  rb_w32_getc(FILE*);