Add PT-BR iOS podcast (#4684)

* Add iOS podcast

* alphabetize

Co-authored-by: Eric Hellman <eric@hellman.net>

free-podcasts-screencasts-pt_BR.md

@@ -64,6 +64,7 @@
 
 ### iOS
 
+* [Build Failed](https://twitter.com/buildfailedcast) (podcast)
 * [CocoaHeads](http://www.cocoaheads.com.br/podcasts) (podcast)