Log Message:
unifont: update to 13.0.04.

2020-11-21: Release 13.0.04
   * Font glyphs are now dual-licensed under the SIL Open Font
     License version 1.1, in addition to the GNU GPL version 2+
     with the GNU Font Embedding Exception.
   * Many glyphs in these ranges were re-aligned so the dominant
     horizontal line would be positioned in row 7, counting from
     the bottom.  Some glyphs were redrawn.
     - U+2190..U+21FF Arrows
     - U+2200..U+23FF Mathematical Operators
     - U+2400..U+24FF Miscellaneous Technical
     - U+25A0..U+25FF Geometric Shapes
     - APL operators such as the tacks and jot were not modified,
       so as not to alter alignments of glyphs that APL superimposes
       on each other.
   * U+2200..U+23FF Mathematical Operators: redrew slashes for
     negated operators from vertical lines to slanted lines.
   * Added three new Under ConScript Unicode Registry (UCSUR) Scripts:
     - U+EB40..U+EB5F Standard Galactic
     - U+EB60..U+EB9F Braille Extended
     - U+EBA0..U+EBDF Cistercian Numerals
   * Other changes listed in the ChangeLog file.