docs: add documentation for config_tool variable method
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@ -1608,6 +1608,10 @@ an external dependency with the following methods:
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pkg-config variable specified, or, if invoked on a non pkg-config
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dependency, error out
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- `get_configtool_variable(varname)` (*Added 0.44.0*) will get the
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command line argument from the config tool (with `--` prepended), or,
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if invoked on a non config-tool dependency, error out.
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- `type_name()` which returns a string describing the type of the
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dependency, the most common values are `internal` for deps created
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with `declare_dependencies` and `pkgconfig` for system dependencies
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@ -0,0 +1,11 @@
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# Config-Tool based dependencies gained a method to get arbitrary options
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A number of dependencies (CUPS, LLVM, pcap, WxWidgets, GnuStep) use a config
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tool instead of pkg-config. As of this version they now have a
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`get_configtool_variable` method, which is analogous to the
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`get_pkgconfig_variable` for pkg config.
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```meson
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dep_llvm = dependency('LLVM')
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llvm_inc_dir = dep_llvm.get_configtool_variable('includedir')
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```
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