Disable parallel build in Make 4.4 (#12244)
Disable parallel build in Make 4.4 (#12244)

In versions of GNU Make prior to 4.4, ".NOTPARALLEL: compile" made the whole
build run serially. In 4.4 and later, ".NOTPARALLEL: compile" makes only
the compile target run serially.

This breaks the build and can lead to e.g. EEx being built before Mix.
elixir-lang/elixir