include: reorganize headers file to include/osmocom/[gsm|core]

This patch moves all GSM-specific definitions to include/osmocom/gsm.
Moreover, the headers in include/osmocore/ have been moved to
include/osmocom/core.

This has been proposed by Harald Welte and Sylvain Munaunt.

Tested with `make distcheck'.

Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
diff --git a/include/osmocom/core/select.h b/include/osmocom/core/select.h
new file mode 100644
index 0000000..5ca21c3
--- /dev/null
+++ b/include/osmocom/core/select.h
@@ -0,0 +1,22 @@
+#ifndef _BSC_SELECT_H
+#define _BSC_SELECT_H
+
+#include <osmocom/core/linuxlist.h>
+
+#define BSC_FD_READ	0x0001
+#define BSC_FD_WRITE	0x0002
+#define BSC_FD_EXCEPT	0x0004
+
+struct bsc_fd {
+	struct llist_head list;
+	int fd;
+	unsigned int when;
+	int (*cb)(struct bsc_fd *fd, unsigned int what);
+	void *data;
+	unsigned int priv_nr;
+};
+
+int bsc_register_fd(struct bsc_fd *fd);
+void bsc_unregister_fd(struct bsc_fd *fd);
+int bsc_select_main(int polling);
+#endif /* _BSC_SELECT_H */