Export symbols in order to support shared libraries (#54)

* Add BAC_ROUTING compile definition

* Reorder cmake

* Fix OpenSSL support: support both 1.0 and 1.1t pus

* Explicitly export symbols, hidden by default

* Build shared libraries on travis using cmake

* Learn Makefile about static library

* Fix build using mingw with cmake

* Do not cleanup twice or after potential free

ports/win32/bacport.h

@@ -26,6 +26,8 @@
 #ifndef BACPORT_H
 #define BACPORT_H
 
+#include "bacnet/bacnet_stack_exports.h"
+
 #define WIN32_LEAN_AND_MEAN
 #define STRICT 1
 /* Windows XP minimum */
@@ -55,7 +57,7 @@ and globals in favor of more secure versions.  */
 /* add winmm.lib to our build */
 #pragma comment(lib, "winmm.lib")
 #endif
-#include <MMSystem.h>
+#include <mmsystem.h>
 
 #if !defined(_MSC_VER)
 #include <sys/time.h>