patch 8.1.0379: build dependencies are incomplete

Problem:    Build dependencies are incomplete.
Solution:   Update the build dependencies, mainly for xdiff.  Adjust object
            directory for libvterm and xdiff.
diff --git a/src/auto/configure b/src/auto/configure
index 74d3e72..907ec6c 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -7916,9 +7916,9 @@
 if test "$enable_terminal" = "yes" -a "$enable_channel" = "yes"; then
   $as_echo "#define FEAT_TERMINAL 1" >>confdefs.h
 
-  TERM_SRC="libvterm/src/encoding.c libvterm/src/keyboard.c libvterm/src/mouse.c libvterm/src/parser.c libvterm/src/pen.c libvterm/src/screen.c libvterm/src/state.c libvterm/src/unicode.c libvterm/src/vterm.c"
+  TERM_SRC="libvterm/src/encoding.c libvterm/src/keyboard.c libvterm/src/mouse.c libvterm/src/parser.c libvterm/src/pen.c libvterm/src/termscreen.c libvterm/src/state.c libvterm/src/unicode.c libvterm/src/vterm.c"
 
-  TERM_OBJ="objects/term_encoding.o objects/term_keyboard.o objects/term_mouse.o objects/term_parser.o objects/term_pen.o objects/term_screen.o objects/term_state.o objects/term_unicode.o objects/term_vterm.o"
+  TERM_OBJ="objects/encoding.o objects/keyboard.o objects/mouse.o objects/parser.o objects/pen.o objects/termscreen.o objects/state.o objects/unicode.o objects/vterm.o"
 
 fi