build(meson): use override_dependency
if supported
#116
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What does this change do?
This improves user experience when using toml++ as a Meson subproject.
With this change users will be able to simply call
dependency('tomlplusplus')
and have Meson automatically resolve the dependency from the subproject if it is not found on the system.Without this, users always have to explicitly call
dependency('tomlplusplus', fallback: ['tomlplusplus', 'tomlplusplus_dep'])
A lot of saved keystrokes :)
Pre-merge checklist
origin/master
(if necessary)