patch 8.0.1680: memory allocated by libvterm is not profiled

Problem:    Memory allocated by libvterm does not show up in profile.
Solution:   Pass allocater functions to vterm_new().

src/terminal.c

@@ -39,14 +39,12 @@
 *
 * TODO:
 * - Add a way to set the 16 ANSI colors, to be used for 'termguicolors' and in
 *   the GUI.
 *   the GUI. #2747
 * - Win32: Make terminal used for :!cmd in the GUI work better.  Allow for
 *   redirection.  Probably in call to channel_set_pipes().
 * - implement term_setsize()
 * - Copy text in the vterm to the Vim buffer once in a while, so that
 *   completion works.
 * - Adding WinBar to terminal window doesn't display, text isn't shifted down.
 *   a job that uses 16 colors while Vim is using > 256.
 * - in GUI vertical split causes problems.  Cursor is flickering. (Hirohito
 *   Higashi, 2017 Sep 19)
 * - after resizing windows overlap. (Boris Staletic, #2164)
@@ -3329,6 +3327,26 @@ static VTermParserCallbacks parser_fallbacks = {
  NULL		/* resize */
};

/*
 * Use Vim's allocation functions for vterm so profiling works.
 */
    static void *
vterm_malloc(size_t size, void *data UNUSED)
{
    return alloc_clear(size);
}

    static void
vterm_memfree(void *ptr, void *data UNUSED)
{
    vim_free(ptr);
}

static VTermAllocatorFunctions vterm_allocator = {
  &vterm_malloc,
  &vterm_memfree
};

/*
 * Create a new vterm and initialize it.
 */
@@ -3340,7 +3358,7 @@ create_vterm(term_T *term, int rows, int cols)
    VTermState	    *state;
    VTermValue	    value;

    vterm = vterm_new(rows, cols);
    vterm = vterm_new_with_allocator(rows, cols, &vterm_allocator, NULL);
    term->tl_vterm = vterm;
    screen = vterm_obtain_screen(vterm);
    vterm_screen_set_callbacks(screen, &screen_callbacks, term);

src/version.c

@@ -762,6 +762,8 @@ static char *(features[]) =

static int included_patches[] =
{   /* Add new patch number below this line */
/**/
    1680,
/**/
    1679,
/**/