user32: Remove unused function

[Andrew Talbot]

Changelog:
    user32: Remove unused function.

diff -urN a/dlls/user32/message.c b/dlls/user32/message.c
--- a/dlls/user32/message.c	2006-12-15 17:26:02.000000000 +0000
+++ b/dlls/user32/message.c	2007-02-05 20:39:33.000000000 +0000
@@ -273,12 +273,6 @@
     return ret;
 }
 
-/* retrieve a string pointer from packed data */
-inline static LPWSTR get_string( void **buffer )
-{
-    return get_data( buffer, (strlenW( (LPWSTR)*buffer ) + 1) * sizeof(WCHAR) );
-}
-
 /* check whether a combobox expects strings or ids in CB_ADDSTRING/CB_INSERTSTRING */
 inline static BOOL combobox_has_strings( HWND hwnd )
 {