ci: add meson android aarch64 build

Passing -Wno-pointer-bool-conversion in cross file
to suppress compiler warning:

src/fcfreetype.c:1373:11: address of array 'os2->achVendID' will always evaluate to 'true'
11 jobs for meson-ci-android in 7 minutes and 7 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #6533952
meson android arm64 fedora

00:01:24

passed #6533950
gst-macos-10.15
meson macos

00:03:52

passed #6533947
meson-mingw-w64-build

00:05:44

manual #6533951
docker windows 1809 allowed to fail manual
meson msys2
passed #6533945
meson-shared-build

00:04:06

passed #6533946
meson-static-build

00:05:28

passed #6533948
docker windows 1809
meson vs2017 amd64

00:01:37

passed #6533949
docker windows 1809
meson vs2017 x86

00:01:21

passed #6533944
mingw-build

00:05:52

passed #6533942
shared-build

00:07:07

passed #6533943
static-build

00:05:36