Renamed bot_developer to botDeveloper to prevent symbol clash.

qagame*.so has a variable named this too, and this confuses the Linux
 dynamic loader since we're not using -fvisibility=hidden.

 Fixes Bugzilla #3944.

code/botlib/be_interface.h

@@ -50,7 +50,7 @@ typedef struct botlib_globals_s
 
 extern botlib_globals_t botlibglobals;
 extern botlib_import_t botimport;
-extern int bot_developer;					//true if developer is on
+extern int botDeveloper;					//true if developer is on
 
 //
 int Sys_MilliSeconds(void);