Auto init/deinit libcrypto

This builds on the previous commit to auto initialise/deinitialise
libcrypto.

Reviewed-by: Richard Levitte <levitte@openssl.org>

crypto/async/arch/async_win.h

@@ -73,7 +73,7 @@ typedef struct async_fibre_st {
         ((c)->fibre = CreateFiber(0, async_start_func_win, 0))
 # define async_fibre_free(f)             (DeleteFiber((f)->fibre))
 
-async_ctx *async_get_ctx(void);
+async_ctx *async_arch_get_ctx(void);
 int async_set_ctx(async_ctx *ctx);
 
 int async_fibre_init_dispatcher(async_fibre *fibre);