select: Rename BSC_FD_* constants to OSMO_FD_*

The naming of these constants dates back to when the code was private
within OpenBSC.  Everything else was renamed (bsc_fd -> osmo_fd) at
the time, but somehow the BSC_FD_* defines have been missed at the
time.

Keep compatibility #defines around, but allow us to migrate the
applications to a less confusing naming meanwhile.

Change-Id: Ifae33ed61a7cf0ae54ad487399e7dd2489986436
diff --git a/src/write_queue.c b/src/write_queue.c
index fb6839a..3399b0f 100644
--- a/src/write_queue.c
+++ b/src/write_queue.c
@@ -47,22 +47,22 @@
 
 	queue = container_of(fd, struct osmo_wqueue, bfd);
 
-	if (what & BSC_FD_READ) {
+	if (what & OSMO_FD_READ) {
 		rc = queue->read_cb(fd);
 		if (rc == -EBADF)
 			goto err_badfd;
 	}
 
-	if (what & BSC_FD_EXCEPT) {
+	if (what & OSMO_FD_EXCEPT) {
 		rc = queue->except_cb(fd);
 		if (rc == -EBADF)
 			goto err_badfd;
 	}
 
-	if (what & BSC_FD_WRITE) {
+	if (what & OSMO_FD_WRITE) {
 		struct msgb *msg;
 
-		fd->when &= ~BSC_FD_WRITE;
+		fd->when &= ~OSMO_FD_WRITE;
 
 		/* the queue might have been emptied */
 		if (!llist_empty(&queue->msg_queue)) {
@@ -76,7 +76,7 @@
 				goto err_badfd;
 
 			if (!llist_empty(&queue->msg_queue))
-				fd->when |= BSC_FD_WRITE;
+				fd->when |= OSMO_FD_WRITE;
 		}
 	}
 
@@ -115,7 +115,7 @@
 
 	++queue->current_length;
 	msgb_enqueue(&queue->msg_queue, data);
-	queue->bfd.when |= BSC_FD_WRITE;
+	queue->bfd.when |= OSMO_FD_WRITE;
 
 	return 0;
 }
@@ -133,7 +133,7 @@
 	}
 
 	queue->current_length = 0;
-	queue->bfd.when &= ~BSC_FD_WRITE;
+	queue->bfd.when &= ~OSMO_FD_WRITE;
 }
 
 /*! @} */