Explicitely add python3-sphinx_rtd_theme as build deps (should fix rhbz#1716509)

Add a patch to fix tests due to over-indenting

0001-pycodestyle-fix-new-warnings.patch

@@ -0,0 +1,27 @@
+From 0ee86ef9d7e06639a388d0638732810b79998608 Mon Sep 17 00:00:00 2001
+From: Christoph Reiter <reiter.christoph@gmail.com>
+Date: Tue, 29 Jan 2019 18:47:16 +0100
+Subject: [PATCH] pycodestyle: fix new warnings
+
+---
+ mutagen/id3/_id3v1.py | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/mutagen/id3/_id3v1.py b/mutagen/id3/_id3v1.py
+index cd303a6131d3..40aded24d28d 100644
+--- a/mutagen/id3/_id3v1.py
++++ b/mutagen/id3/_id3v1.py
+@@ -147,8 +147,8 @@ def ParseID3v1(data, v2_version=4, known_frames=None):
+         elif frame_class["TDRC"]:
+             frames["TDRC"] = frame_class["TDRC"](encoding=0, text=year)
+     if comment and frame_class["COMM"]:
+-            frames["COMM"] = frame_class["COMM"](
+-                encoding=0, lang="eng", desc="ID3v1 Comment", text=comment)
++        frames["COMM"] = frame_class["COMM"](
++            encoding=0, lang="eng", desc="ID3v1 Comment", text=comment)
+ 
+     # Don't read a track number if it looks like the comment was
+     # padded with spaces instead of nulls (thanks, WinAmp).
+-- 
+2.21.0
+