patch 8.0.1614: "make tags" doesn't include libvterm

Problem:    "make tags" doesn't include libvterm.
Solution:   Add the libvterm sources to the tags command.

src/Makefile

@@ -1396,6 +1396,8 @@ TERM_DEPS = \
 	libvterm/src/utf8.h \
 	libvterm/src/vterm_internal.h
 
+TERM_SRC = libvterm/src/*.c
+
 ### Command to create dependencies based on #include "..."
 ### prototype headers are ignored due to -DPROTO, system
 ### headers #include <...> are ignored if we use the -MM option, as
@@ -2040,7 +2042,7 @@ notags:
 #	Motif and Athena GUI
 # You can ignore error messages for missing files.
 tags TAGS: notags
-	$(TAGPRG) $(TAGS_SRC) $(TAGS_INCL)
+	$(TAGPRG) $(TAGS_SRC) $(TAGS_INCL) $(TERM_SRC) $(TERM_DEPS)
 
 # Make a highlight file for types.  Requires Exuberant ctags and awk
 types: types.vim

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1614,
 /**/
     1613,
 /**/