Simplify via eabs.

Simplify via eabs.

* dired.c (file_name_completion):
* doc.c (get_doc_string):
* floatfns.c (round2):
* font.c (font_score, font_delete_unmatched):
* fringe.c (compute_fringe_widths):
* lread.c (read_list):
* minibuf.c (Ftry_completion):
* term.c (tty_ins_del_lines):
* xterm.c (x_draw_image_foreground, x_draw_image_foreground_1):
Use eabs (x) rather than open-coding it as (x < 0 ? -x : x).