CMake: find PangoFT2 when wxUSE_PRIVATE_FONTS is enabled in GTK

Rewrite and simplify FindFontconfig.

build/cmake/modules/FindPangoFT2.cmake

@@ -0,0 +1,30 @@
+# - Try to find PangoFT2
+# Once done this will define
+#
+#  PANGOFT2_FOUND - system has PangoFT2
+#  PANGOFT2_INCLUDE_DIRS - The include directory to use for the PangoFT2 headers
+#  PANGOFT2_LIBRARIES - Link these to use PangoFT2
+
+find_package(PkgConfig)
+pkg_check_modules(PC_PANGOFT2 QUIET pangoft2)
+
+find_path(PANGOFT2_INCLUDE_DIRS
+    NAMES pango-context.h
+    HINTS ${PC_PANGOFT2_INCLUDEDIR}
+          ${PC_PANGOFT2_INCLUDE_DIRS}
+    PATH_SUFFIXES pango
+)
+
+find_library(PANGOFT2_LIBRARIES
+    NAMES pangoft2-1.0
+    HINTS ${PC_PANGOFT2_LIBDIR}
+          ${PC_PANGOFT2_LIBRARY_DIRS}
+)
+
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(PANGOFT2 REQUIRED_VARS PANGOFT2_INCLUDE_DIRS PANGOFT2_LIBRARIES)
+
+mark_as_advanced(
+    PANGOFT2_INCLUDE_DIRS
+    PANGOFT2_LIBRARIES
+)