Some packages have issues with parallel builds and need to set
TERMUX_MAKE_PROCESSES=1. All other build variables that package
recipes set are prefixed with TERMUX_PKG, use that for MAKE_PROCESSES
as well for consistency.
%ci:no-build
Currently amber have two subpackages: ambr and ambs
There is a cyclic dependency between these: ambr depends each
subpackage, and each subpackage depends on ambr.
This makes scripts/buildorder.py (used by build-all.sh) error out.
And there is also no point in this current package split, as all three
packages will always be installed together due to the cyclic dependency.
So let's remove the subpackage split.
