[nana] Fix fontconfig dependency (#15595)

* [nana] Fix fontconfig dependency

* Update link library

* Update find_package() as find_dependency() in config.cmake.in

* Remove keyword REQUIRED from find_dependency()

ports/nana/CMakeLists.txt

@@ -47,8 +47,8 @@ if(UNIX)
   target_include_directories(nana PUBLIC ${X11_INCLUDE_DIR})
   target_link_libraries(nana PUBLIC ${X11_LIBRARIES} ${X11_Xft_LIB})
 
-  find_library(FONTCONFIG_LIB NAMES fontconfig)
-  target_link_libraries(nana PUBLIC ${FONTCONFIG_LIB})
+  find_package(Fontconfig REQUIRED)
+  target_link_libraries(nana PUBLIC Fontconfig::Fontconfig)
 endif()
 
 if(NANA_ENABLE_PNG)

ports/nana/CONTROL

@@ -1,5 +1,6 @@
 Source: nana
 Version: 1.7.4
+Port-Version: 1
 Homepage: https://github.com/cnjinhao/nana
 Description: Cross-platform library for GUI programming in modern C++ style.
 Build-Depends: libpng, libjpeg-turbo, freetype (!uwp&&!windows), fontconfig (!uwp&&!windows)

ports/nana/config.cmake.in

@@ -1,27 +1,28 @@
 @PACKAGE_INIT@
+include(CMakeFindDependencyMacro)
 
 if(UNIX)
-  find_package(Threads REQUIRED)
-  find_package(Freetype REQUIRED)
-  find_package(X11 REQUIRED)
-  find_library(FONTCONFIG_LIB NAMES fontconfig)
+  find_dependency(Threads)
+  find_dependency(Freetype)
+  find_dependency(X11)
+  find_dependency(Fontconfig)
 endif()
 
 option(NANA_ENABLE_PNG "Enable PNG support" @NANA_ENABLE_PNG@)
 option(NANA_ENABLE_JPEG "Enable JPEG support" @NANA_ENABLE_JPEG@)
 
 if(NANA_ENABLE_PNG)
-  find_package(PNG REQUIRED)
+  find_dependency(PNG)
 endif()
 
 if(NANA_ENABLE_JPEG)
-  find_package(JPEG REQUIRED)
+  find_dependency(JPEG)
 endif()
 
 include("${CMAKE_CURRENT_LIST_DIR}/unofficial-nana-targets.cmake")
 
 if(UNIX)
-  target_link_libraries(unofficial::nana::nana INTERFACE ${FONTCONFIG_LIB} ${X11_LIBRARIES} ${X11_Xft_LIB})
+  target_link_libraries(unofficial::nana::nana INTERFACE Fontconfig::Fontconfig ${X11_LIBRARIES} ${X11_Xft_LIB})
 endif()
 
 if(NANA_ENABLE_JPEG)