Add versioning information to mbed OS 5.5 release branch

Author: sg-

mbed.h

@@ -16,6 +16,28 @@
 #ifndef MBED_H
 #define MBED_H
 
+#define MBED_LIBRARY_VERSION -1
+
+#if MBED_CONF_RTOS_PRESENT
+// RTOS present, this is valid only for mbed OS 5
+#define MBED_MAJOR_VERSION 5
+#define MBED_MINOR_VERSION 5
+#define MBED_PATCH_VERSION -1
+
+#else
+// mbed 2
+#define MBED_MAJOR_VERSION 2
+#define MBED_MINOR_VERSION 0
+#define MBED_PATCH_VERSION MBED_LIBRARY_VERSION
+#endif
+
+#define MBED_ENCODE_VERSION(major, minor, patch) ((major)*10000 + (minor)*100 + (patch))
+#define MBED_VERSION MBED_ENCODE_VERSION(MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION)
+
+#if MBED_CONF_RTOS_PRESENT
+#include "rtos/rtos.h"
+#endif
+
 #if MBED_CONF_RTOS_PRESENT
 #include "rtos/rtos.h"
 #endif