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/botlib.h

@@ -443,7 +443,7 @@ name:						default:			module(s):			description:
 "log"						"0"					l_log.c				enable/disable creating a log file
 "maxclients"				"4"					be_interface.c		maximum number of clients
 "maxentities"				"1024"				be_interface.c		maximum number of entities
-"bot_developer"				"0"					be_interface.c		bot developer mode
+"bot_developer"				"0"					be_interface.c		bot developer mode (it's "botDeveloper" in C to prevent symbol clash).
 
 "phys_friction"				"6"					be_aas_move.c		ground friction
 "phys_stopspeed"			"100"				be_aas_move.c		stop speed