style: Start applying PEP8 to Python files, indentation issues

Done with `autopep8 --select=E1`, fixes:

- E101 - Reindent all lines.
- E112 - Fix under-indented comments.
- E113 - Fix over-indented comments.
- E115 - Fix under-indented comments.
- E116 - Fix over-indented comments.
- E121 - Fix a badly indented line.
- E122 - Fix a badly indented line.
- E123 - Fix a badly indented line.
- E124 - Fix a badly indented line.
- E125 - Fix indentation undistinguish from the next logical line.
- E126 - Fix a badly indented line.
- E127 - Fix a badly indented line.
- E128 - Fix a badly indented line.
- E129 - Fix a badly indented line.

drivers/SCsub

@@ -5,7 +5,7 @@ Import('env')
 env.drivers_sources=[]
 
 if ("builtin_zlib" in env and env["builtin_zlib"] == "yes"):
-	SConscript("zlib/SCsub");
+    SConscript("zlib/SCsub");
 
 # OS drivers
 SConscript('unix/SCsub');
@@ -15,9 +15,9 @@ SConscript('windows/SCsub');
 SConscript('alsa/SCsub');
 SConscript('pulseaudio/SCsub');
 if (env["platform"] == "windows"):
-	SConscript("rtaudio/SCsub");
+    SConscript("rtaudio/SCsub");
 if (env["xaudio2"] == "yes"):
-	SConscript("xaudio2/SCsub");
+    SConscript("xaudio2/SCsub");
 
 # Graphics drivers
 SConscript('gles2/SCsub');
@@ -29,14 +29,14 @@ SConscript("png/SCsub");
 # Tools override
 # FIXME: Should likely be integrated in the tools/ codebase
 if (env["tools"]=="yes"):
-	SConscript("convex_decomp/SCsub");
+    SConscript("convex_decomp/SCsub");
 
 if env['vsproj']=="yes":
-	env.AddToVSProject(env.drivers_sources)
+    env.AddToVSProject(env.drivers_sources)
 
 if env.split_drivers:
-	env.split_lib("drivers")
+    env.split_lib("drivers")
 else:
-	env.add_source_files(env.drivers_sources,"*.cpp")
-	lib = env.Library("drivers",env.drivers_sources)
-	env.Prepend(LIBS=[lib])
+    env.add_source_files(env.drivers_sources,"*.cpp")
+    lib = env.Library("drivers",env.drivers_sources)
+    env.Prepend(LIBS=[lib])