nowsys fixes (Lou Kamenov)

src/libdraw/nowsys-itrans.c

@@ -1,3 +1,23 @@
-/* so that there's *something* in this file */
-int __nowsys__itrans(void) {return 0;}
+#include <u.h>
+#include <libc.h>
  
+static int
+bad(void)
+{
+    sysfatal("compiled with no window system support");
+    return 0;
+}
+
+void
+putsnarf(char *data)
+{
+	USED(data);
+	bad();
+}
+
+char*
+getsnarf(void)
+{
+	bad();
+	return nil;
+}

src/libdraw/nowsys-mouse.c

@@ -5,6 +5,7 @@
 #include <cursor.h>
 #include <mouse.h>
 
+int _wantfocuschanges;
 static int
 bad(void)
 {