Add guarded ssl_msg.c to Makefiles
This commit adds the newly created copy ssl_msg.c of ssl_tls.c
to the build system but guards its content by an `#if 0 ... #endif`
preprocessor guard in order to avoid compilation failures resulting
from code duplication. This guard will be removed once the contents
of ssl_tls.c and ssl_msg.c have been made disjoint.
diff --git a/library/Makefile b/library/Makefile
index 6fc110c..6debdfd 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -77,6 +77,7 @@
OBJS_TLS= debug.o net_sockets.o \
ssl_cache.o ssl_ciphersuites.o \
ssl_cli.o ssl_cookie.o \
+ ssl_msg.o \
ssl_srv.o ssl_ticket.o \
ssl_tls.o