Remove 'static' qualifier from Conf pointer

Configuration pointer is globally visible from winstuff.h, so it cannot
be 'static' any longer.

pscp.c

@@ -43,7 +43,7 @@ static bool using_sftp = false;
 static bool uploading = false;
 
 static Backend *backend;
-static Conf *conf;
+Conf *conf;
 bool sent_eof = false;
 
 static void source(const char *src);

psftp.c

@@ -34,7 +34,7 @@ static void do_sftp_cleanup(void);
 
 char *pwd, *homedir;
 static Backend *backend;
-static Conf *conf;
+Conf *conf;
 bool sent_eof = false;
 
 /* ------------------------------------------------------------

unix/uxplink.c

@@ -41,7 +41,7 @@ void cmdline_error(const char *fmt, ...)
 static bool local_tty = false; /* do we have a local tty? */
 
 static Backend *backend;
-static Conf *conf;
+Conf *conf;
 
 /*
  * Default settings that are specific to Unix plink.

windows/winplink.c

@@ -38,7 +38,7 @@ DWORD orig_console_mode;
 WSAEVENT netevent;
 
 static Backend *backend;
-static Conf *conf;
+Conf *conf;
 
 bool term_ldisc(Terminal *term, int mode)
 {