meson: Fix pythondetector on Debian and use sysconfig for getting the ABIFLAGS too
Paths like /usr/lib/python3.5/config-3.5m-x86_64-linux-gnu would not be detected by the old code, but it's all nicely stored in sysconfig so let's just use that.
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Paths like /usr/lib/python3.5/config-3.5m-x86_64-linux-gnu would not be detected by the old code, but it's all nicely stored in sysconfig so let's just use that.