freetype: Update to 2.10.4

freetype: Update to 2.10.4

- Update freetype from 2.10.2 to 2.10.4
	- A heap buffer overflow has been found in the handling of embedded
	PNG bitmaps, introduced in FreeType version 2.6.
	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15999
	If you use option FT_CONFIG_OPTION_USE_PNG you should upgrade immediately.
- Version 2.10.3 and later breaks the build of ghostscript, due to ghostscripts
	use of a withdrawn freetype macro that wasn't for external usage.
	A patch has been created to fix this and is included in the connected
	ghostcript patch.
- Updated rootfile
- Changelog for version 2.10.3 release is too long to add here. This can be
	found in the changelog file in the tarball

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>