CI: Use custom vcpkg libtorrent port

vcpkg/libtorrent/no_use_iconv.patch

@@ -0,0 +1,31 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 9efd451fb..05066be82 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -643,26 +643,6 @@ target_optional_compile_definitions(torrent-rasterbar PUBLIC FEATURE NAME mutabl
+ target_optional_compile_definitions(torrent-rasterbar PUBLIC FEATURE NAME streaming DEFAULT ON
+ 	DESCRIPTION "Enables support for piece deadline" DISABLED TORRENT_DISABLE_STREAMING)
+
+-find_public_dependency(Iconv)
+-if(MSVC)
+-	set(iconv_package_type OPTIONAL)
+-else()
+-	set(iconv_package_type RECOMMENDED)
+-endif()
+-
+-set_package_properties(Iconv
+-	PROPERTIES
+-		URL "https://www.gnu.org/software/libiconv/"
+-		DESCRIPTION "GNU encoding conversion library"
+-		TYPE ${iconv_package_type}
+-		PURPOSE "Convert strings between various encodings"
+-)
+-
+-if(Iconv_FOUND)
+-	target_compile_definitions(torrent-rasterbar PUBLIC TORRENT_USE_ICONV)
+-	target_link_libraries(torrent-rasterbar PRIVATE Iconv::Iconv)
+-endif()
+-
+ find_public_dependency(OpenSSL)
+ set_package_properties(OpenSSL
+ 	PROPERTIES