apkbuild parser: problem with variables containing other variables
ERROR: Could not resolve variable $_depends_dev in APKBUILD of linux-rpi
see https://git.alpinelinux.org/aports/tree/main/linux-rpi/APKBUILD#n13
ERROR: Could not resolve variable $_depends_dev in APKBUILD of linux-rpi
see https://git.alpinelinux.org/aports/tree/main/linux-rpi/APKBUILD#n13