update PythonPackage
easyblock to allow installation of Python packages with $PIP_REQUIRE_VIRTUALENV
set + move temporary pip folder into build dir
#3374
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Using the tempdir usually works but the contents of that folder are usually build artifacts.
As they might become rather large use the builddir for $XDG_CACHE_HOME instead.
As an alternative
os.path.abspath(build_path())
could be used but that might clash with parallel installations.The user using EasyBuild might have $PIP_REQUIRE_VIRTUALENV set which will fail the installation of PythonPackages with
So disable this.
pip 20.2.3+ seems to require
false
as the value instead of any other value (including the empty string)