FindGTK2: Link freetype libs to targets including freetype includes
FindGTK2: Fix gmodule, glibmm, pangoft2, and pangoxft targets
FindGTK2: Add check to ensure that target exists
FindGTK2: Add unit tests for all targets in gtk and gtkmm modules
FindGTK2: Mark GTK_*_INCLUDE_DIR as advanced
FindGTK2: Find freetype quietly
FindGTK2: Search for modules quietly when needed
Merge topic 'FindGTK2-quiet' into next

1e18051 FindGTK2: Search for modules quietly when needed
873333d FindGTK2: Find freetype quietly
53265aa FindGTK2: Mark GTK_*_INCLUDE_DIR as advanced
Merge topic 'FindGTK2-targets' into next

d346654 FindGTK2: Add unit tests for all targets in gtk and gtkmm modules
44e7ca4 FindGTK2: Add check to ensure that target exists
a59c96d FindGTK2: Fix gmodule, glibmm, pangoft2, and pangoxft targets
7316bc8 FindGTK2: Link freetype libs to targets including freetype includes