Proper support for using the font's own character encoding. If we

know what that encoding actually is, we can do our best to support
additional charsets (VT100 linedrawing, SCO ACS, UTF-8 mode) using
the available characters; if we don't, we fall back to a mode where
we disable all Unicode cut-and-paste and assume any Unicode
character is undisplayable.

[originally from svn r2413]

unix/unix.h

@@ -66,4 +66,9 @@ int next_socket(int *state, int *rwx);
 /* BSD-semantics version of signal() */
 void (*putty_signal(int sig, void (*func)(int)))(int);
 
+/*
+ * Exports from unicode.c.
+ */
+void init_ucs(int font_charset);
+
 #endif