Remove QEMU workaround for aarch64
The contents of libweston-desktop-7.0.0-r0.apk built with this MR (symlink exists):
-rw-r--r-- root/root 256 2019-09-18 18:58 .SIGN.RSA.pmos-5bb3815c.rsa.pub
-rw-r--r-- root/root 604 2019-09-18 18:58 .PKGINFO
drwxr-xr-x root/root 0 2019-09-18 18:58 usr/
drwxr-xr-x root/root 0 2019-09-18 18:58 usr/lib/
lrwxrwxrwx root/root 0 2019-09-18 18:58 usr/lib/libweston-desktop-7.so.0 -> libweston-desktop-7.so.0.0.0
-rwxr-xr-x root/root 63448 2019-09-18 18:58 usr/lib/libweston-desktop-7.so.0.0.0
Closes #546 (closed)