docs: add documentation for config_tool variable method

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+# Config-Tool based dependencies gained a method to get arbitrary options
+
+A number of dependencies (CUPS, LLVM, pcap, WxWidgets, GnuStep) use a config
+tool instead of pkg-config. As of this version they now have a
+`get_configtool_variable` method, which is analogous to the
+`get_pkgconfig_variable` for pkg config.
+
+```meson
+dep_llvm = dependency('LLVM')
+llvm_inc_dir = dep_llvm.get_configtool_variable('includedir')
+```