legion: add missing build dependency and new variants (#44329)

* legion: add pip dependency for build

pip is needed for the build when the Legion Python binding is enabled

* legion: add variants for gc logging and system OpenMP use

This also removes the `cmake_cxx_flags` variable from `cmake_args()`
because that variable had no effect.

* [@spackbot] updating style on behalf of mpokorny

* legion: use spec.satisfies() in cmake_args()

e.g, replace use of '"+foo" in spec' with 'spec.satisfies("+foo")'

* legion: avoid configuring with multiple "-DLegion_REDOP_COMPLEX=ON" arguments

In the previous version, when both '+redop_complex' and '+bindings'
was set, two instances of "-DLegion_REDOP_COMPLEX=ON" arguments were
generated for cmake configuration.

* legion: fix value of "Legion_OUTPUT_LEVEL" for configuration

the previous version had no effect on setting the configuration value

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Co-authored-by: mpokorny <mpokorny@users.noreply.github.com>

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