backtrace: don't use fprintf, but printf (for osmocom-bb)
diff --git a/src/backtrace.c b/src/backtrace.c
index 4ca7adb..5b93bec 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -81,7 +81,7 @@
 #else
 void osmo_generate_backtrace(void)
 {
-	fprintf(stderr, "This platform has no backtrace function\n");
+	printf("This platform has no backtrace function\n");
 }
 void osmo_log_backtrace(int subsys, int level)
 {