[Pidgin] #1344: fix for some build warnings

[Pidgin]

#1344: fix for some build warnings
----------------------------+-----------------------------------------------
  Reporter:  o_sukhodolsky  |       Owner:  rlaager 
      Type:  patch          |      Status:  assigned
  Priority:  minor          |   Milestone:  2.0.2   
 Component:  pidgin (gtk)   |     Version:  2.0.1   
Resolution:                 |    Keywords:          
   Pending:  0              |  
----------------------------+-----------------------------------------------
Comment (by rlaager):

 _() is a macro that calls gettext(). It is defined in libpurple/internal.h
 for us. We cast it to const char, as per the man page of gettext, which
 says, "The return type ought to be const char *, but is char * to avoid
 warnings in C code predating ANSI C." That call is fine.

 Basically, line needs to be changed to be const char, and then all the
 warnings that pop-up from that need to be fixed, which is going to be non-
 trivial, because the log reader code sucks (I know, I wrote it a LONG time
 ago). If you want to tackle this, that'd be amazing, but you certainly
 don't have to. ;)

-- 
Ticket URL: <http://developer.pidgin.im/ticket/1344#comment:12>
Pidgin <http://pidgin.im>
Pidgin