Return previous compression methods when setting them.

ssl/ssl.h

diff --git a/ssl/ssl.h b/ssl/ssl.h
index 4f38c3b..13e7b72 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -2503,7 +2503,7 @@
 const COMP_METHOD *SSL_get_current_expansion(SSL *s);
 const char *SSL_COMP_get_name(const COMP_METHOD *comp);
 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void);
-void SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP) *meths);
+STACK_OF(SSL_COMP) *SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP) *meths);
 int SSL_COMP_add_compression_method(int id,COMP_METHOD *cm);
 #else
 const void *SSL_get_current_compression(SSL *s);