Allow installation with parametrisable backend language

[EmilyBourne]

Allow Psydac to be installed with a parametrisable backend (C or Fortran). Following changes to the meson files generated by Pyccel the root meson.build file is updated to define py and m_dep.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (bc87faa)	31788	19587	61.62%
Head commit (426b4a6)	63576 (+31788)	39174 (+19587)	61.62% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#577)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[yguclu]

Thanks a lot for the fix, @EmilyBourne!