winmm/joystick: joystick.c requires unicode library

[Andrew Talbot]

winmm/joystick/joystick.c uses strcpyW().
---
Changelog:
    winmm/joystick: joystick.c requires unicode library.

diff -urN a/dlls/winmm/joystick/Makefile.in b/dlls/winmm/joystick/Makefile.in
--- a/dlls/winmm/joystick/Makefile.in	2004-12-06 20:55:26.000000000 +0000
+++ b/dlls/winmm/joystick/Makefile.in	2006-05-30 20:00:17.000000000 +0100
@@ -4,6 +4,7 @@
 VPATH     = @srcdir@
 MODULE    = joystick.drv
 IMPORTS   = winmm user32 kernel32
+EXTRALIBS = $(LIBUNICODE)
 
 C_SRCS = \
 	joystick.c