community/prismlauncher: use upstream patch to fix build
Fixes error found during 3.19 rebuild: https://build.alpinelinux.org/buildlogs/build-3-19-armv7/community/prismlauncher/prismlauncher-7.2-r0.log
Fixes error found during 3.19 rebuild: https://build.alpinelinux.org/buildlogs/build-3-19-armv7/community/prismlauncher/prismlauncher-7.2-r0.log