Improve frame synchronization support on Haiku

* src/ftcrfont.c (ftcrfont_draw):
* src/haikufns.c (haiku_set_background_color):
* src/haikuterm.c (haiku_clip_to_string):
(haiku_clip_to_string_exactly):
(haiku_clear_frame_area):
(haiku_clear_frame):
(haiku_draw_box_rect):
(haiku_draw_relief_rect):
(haiku_draw_underwave):
(haiku_draw_text_decoration):
(haiku_draw_plain_background):
(haiku_draw_stipple_background):
(haiku_draw_glyph_string_foreground):
(haiku_draw_glyphless_glyph_string_foreground):
(haiku_draw_stretch_glyph_string):
(haiku_start_clip):
(haiku_end_clip):
(haiku_clip_to_row):
(haiku_draw_composite_glyph_string_foreground):
(haiku_draw_image_glyph_string):
(haiku_draw_glyph_string):
(haiku_after_update_window_line):
(haiku_draw_hollow_cursor):
(haiku_draw_bar_cursor):
(haiku_draw_vertical_window_border):
(haiku_draw_window_divider):
(haiku_scroll_bar_create):
(haiku_set_horizontal_scroll_bar):
(haiku_set_vertical_scroll_bar):
(haiku_draw_fringe_bitmap):
(haiku_scroll_run):
(haiku_read_socket):
(haiku_flash):
(haiku_clear_under_internal_border):
(haiku_scroll_bar_remove):
* src/haikuterm.h (MAKE_FRAME_DIRTY):
(FRAME_CR_CONTEXT): Don't dirty frames if not necessary.

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