raop: Move base64 implementation to a util file

Base64 implementation is now in a common file called raop_util.c.
Old Base64 files are removed but copyright is preserved.

Original patch by Martin Blanchard, patch splitted by
Hajime Fujita <crisp.fujita@nifty.com>.

src/modules/raop/base64.h

@@ -1,32 +0,0 @@
-#ifndef foobase64hfoo
-#define foobase64hfoo
-
-/***
-  This file is part of PulseAudio.
-
-  Copyright 2008 Colin Guthrie
-  Copyright Kungliga Tekniska högskolan
-
-  PulseAudio is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License as published
-  by the Free Software Foundation; either version 2.1 of the License,
-  or (at your option) any later version.
-
-  PulseAudio is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
-***/
-
-/***
-  This file was originally inspired by a file developed by
-  Kungliga Tekniska högskolan
-***/
-
-int pa_base64_encode(const void *data, int size, char **str);
-int pa_base64_decode(const char *str, void *data);
-
-#endif