src: use new library libosmogsm and new path to headers in libosmocore

libosmogsm is a new library that is distributed in the libosmocore.
Now, openbsc depends on it. This patch gets openbsc with this
change.

This patch also rewrites all include path to the new
osmocom/[gsm|core]

Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
diff --git a/openbsc/src/utils/rs232.c b/openbsc/src/utils/rs232.c
index 7550571..5c20531 100644
--- a/openbsc/src/utils/rs232.c
+++ b/openbsc/src/utils/rs232.c
@@ -27,8 +27,8 @@
 #include <termios.h>
 #include <fcntl.h>
 
-#include <osmocore/select.h>
-#include <osmocore/msgb.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/msgb.h>
 #include <openbsc/debug.h>
 #include <openbsc/gsm_data.h>
 #include <openbsc/rs232.h>