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_aas_main.c

@@ -247,7 +247,7 @@ int AAS_StartFrame(float time)
 	//
 	aasworld.frameroutingupdates = 0;
 	//
-	if (bot_developer)
+	if (botDeveloper)
 	{
 		if (LibVarGetValue("showcacheupdates"))
 		{