cosmetic: convert explicit warnings to fixme/todo

We do not use this style (#warning as an issue tracker replacement) in
any other Osmocom project. Also those warnings clutter compiler output
making it harder to spot warnings for the actual code.

Change-Id: I72070e2a027e60e8b80c12ccfa23ff075434689f
diff --git a/src/osmobts_sock.cpp b/src/osmobts_sock.cpp
index e9b85ab..31715d5 100644
--- a/src/osmobts_sock.cpp
+++ b/src/osmobts_sock.cpp
@@ -108,7 +108,8 @@
 #endif
 		for (ts = 0; ts < 8; ts++)
 			bts->trx[trx].pdch[ts].disable();
-#warning "NOT ALL RESOURCES are freed in this case... inconsistent with the other code. Share the code with pcu_l1if.c for the reset."
+/* FIXME: NOT ALL RESOURCES are freed in this case... inconsistent with the other code. Share the code with pcu_l1if.c
+for the reset. */
 		gprs_rlcmac_tbf::free_all(&bts->trx[trx]);
 	}