freetype: use meson instead of autotools

freetype: use meson instead of autotools

Port the options to Meson, and drop all of the autoconf tweaking.

Enable Harfbuzz support using dynamic loading by default. If Harfbuzz is
present at runtime then FreeType will use it for improved hinting. Do
not RDEPENDS on harfbuzz so that it's only used if already present in
the rendering stack.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>