audio/zinf: unbreak with libc++ 3.9

src/Http.cpp:771:11: error: cannot initialize a variable of type 'char *' with an rvalue of type 'const char *'

char* cp = strstr(buffer, "Content-Length:");
      ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/downloadmanager.cpp:401:15: error: cannot initialize a variable of type 'char *' with an rvalue

of type 'const char *'
  char* extension = strrchr(url, '.');
        ^           ~~~~~~~~~~~~~~~~~

src/downloadmanager.cpp:561:11: error: cannot initialize a variable of type 'char *' with an rvalue

  of type 'const char *'
char* cp = strstr(buffer, "Content-Length:");
      ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/downloadmanager.cpp:575:11: error: cannot initialize a variable of type 'char *' with an rvalue

  of type 'const char *'
char* cp = strstr(buffer, "Last-Modified:");
      ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/downloadmanager.cpp:799:24: error: assigning to 'char *' from incompatible type 'const char *'

file = strchr(item->SourceURL().c_str() + 7, '/');
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/player.cpp:552:21: error: assigning to 'char *' from incompatible type 'const char *'

extension = strrchr(url.c_str(), '.');
            ^~~~~~~~~~~~~~~~~~~~~~~~~

src/player.cpp:1109:17: error: assigning to 'char *' from incompatible type 'const char *'

temp_proto = strstr(title, "://");
             ^~~~~~~~~~~~~~~~~~~~

src/player.cpp:1129:15: error: assigning to 'char *' from incompatible type 'const char *'

temp_ext = strrchr(title, '.');
           ^~~~~~~~~~~~~~~~~~~

src/player.cpp:1964:14: error: cannot initialize a variable of type 'char *' with an rvalue of type

'const char *'
 char *port = strchr(buffer.c_str(),':');
       ^      ~~~~~~~~~~~~~~~~~~~~~~~~~~

src/playlist.cpp:1964:15: error: cannot initialize a variable of type 'char *' with an rvalue of type

'const char *'
  char* extension = strrchr(url, '.');
        ^           ~~~~~~~~~~~~~~~~~

src/playlist.cpp:2045:15: error: cannot initialize a variable of type 'char *' with an rvalue of type

'const char *'
  char* extension = strrchr(url, '.');
        ^           ~~~~~~~~~~~~~~~~~

src/ThemeZip.cpp:150:15: error: assigning to 'char *' from incompatible type 'const char *'

pPtr = strrchr(oFile.c_str(), DIR_MARKER);
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/wavoutpmo.cpp:127:10: error: cannot initialize a variable of type 'char *' with an rvalue of type

   'const char *'
char *pPtr = strrchr(GetUrl().c_str(), DIR_MARKER);
      ^      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/ZinfTheme.cpp:1768:26: error: assigning to 'char *' from incompatible type 'const char *'

        pExtension = strrchr((*i).c_str(), '.');
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
pPtr = strrchr(m_oPath.c_str(), '/');
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

unix/src/cdpmo.cpp:116:10: error: cannot initialize a variable of type 'char *' with an rvalue of

   type 'const char *'
char *tracknumber = strrchr(url, '/');
      ^             ~~~~~~~~~~~~~~~~~

unix/src/GTKPreferenceWindow.cpp:1755:20: error: cannot initialize a variable of type 'char *' with

an rvalue of type 'const char *'
       char *name = strrchr((*i).second.c_str(), '/');
             ^      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

unix/src/gtkmusicbrowser.cpp:1206:11: error: cannot initialize a variable of type 'char *' with an rvalue of type 'const char *'

char *ext = strrchr(m_currentListName.c_str(), '.');
      ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

misc.cpp:109:14: error: assigning to 'char *' from incompatible type 'const char *'

cp = strrchr(url, '.');
     ^~~~~~~~~~~~~~~~~

id3lib.cpp:366:11: error: cannot initialize a variable of type 'char *' with an rvalue of type

  'const char *'
char *ptr = strrchr(url, '.');
      ^     ~~~~~~~~~~~~~~~~~

id3lib.cpp:426:11: error: assigning to 'char *' from incompatible type 'const char *'

ptr = strrchr(url, '.');
      ^~~~~~~~~~~~~~~~~

id3lib.cpp:488:11: error: cannot initialize a variable of type 'char *' with an rvalue of type

  'const char *'
char *ptr = strrchr(url.c_str(), '.');
      ^     ~~~~~~~~~~~~~~~~~~~~~~~~~

vorbis.cpp:151:11: error: assigning to 'char *' from incompatible type 'const char *'

ptr = strrchr(url, '.');
      ^~~~~~~~~~~~~~~~~

Reported by: pkg-fallout