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/select.c b/src/select.c
index 4e7be35..7ce135f 100644
--- a/src/select.c
+++ b/src/select.c
@@ -55,7 +55,7 @@
 /*! Set up an osmo-fd. Will not register it.
  *  \param[inout] ofd Osmo FD to be set-up
  *  \param[in] fd OS-level file descriptor number
- *  \param[in] when bit-mask of BSC_FD_{READ,WRITE,EXECEPT}
+ *  \param[in] when bit-mask of OSMO_FD_{READ,WRITE,EXECEPT}
  *  \param[in] cb Call-back function to be called
  *  \param[in] data Private context pointer
  *  \param[in] priv_nr Private number
@@ -171,13 +171,13 @@
 	int highfd = 0;
 
 	llist_for_each_entry(ufd, &osmo_fds, list) {
-		if (ufd->when & BSC_FD_READ)
+		if (ufd->when & OSMO_FD_READ)
 			FD_SET(ufd->fd, readset);
 
-		if (ufd->when & BSC_FD_WRITE)
+		if (ufd->when & OSMO_FD_WRITE)
 			FD_SET(ufd->fd, writeset);
 
-		if (ufd->when & BSC_FD_EXCEPT)
+		if (ufd->when & OSMO_FD_EXCEPT)
 			FD_SET(ufd->fd, exceptset);
 
 		if (ufd->fd > highfd)
@@ -199,17 +199,17 @@
 		int flags = 0;
 
 		if (FD_ISSET(ufd->fd, readset)) {
-			flags |= BSC_FD_READ;
+			flags |= OSMO_FD_READ;
 			FD_CLR(ufd->fd, readset);
 		}
 
 		if (FD_ISSET(ufd->fd, writeset)) {
-			flags |= BSC_FD_WRITE;
+			flags |= OSMO_FD_WRITE;
 			FD_CLR(ufd->fd, writeset);
 		}
 
 		if (FD_ISSET(ufd->fd, exceptset)) {
-			flags |= BSC_FD_EXCEPT;
+			flags |= OSMO_FD_EXCEPT;
 			FD_CLR(ufd->fd, exceptset);
 		}
 
@@ -327,7 +327,7 @@
 {
 	ofd->cb = cb;
 	ofd->data = data;
-	ofd->when = BSC_FD_READ;
+	ofd->when = OSMO_FD_READ;
 
 	if (ofd->fd < 0) {
 		int rc;