[libiconv] use vcpkg_install_copyright() (#32475)

- [x] Changes comply with the [maintainer
guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md)
- [ ] ~~SHA512s are updated for each updated download~~
- [ ] ~~The "supports" clause reflects platforms that may be fixed by
this new version~~
- [ ] ~~Any fixed [CI
baseline](https://github.com/microsoft/vcpkg/blob/master/scripts/ci.baseline.txt)
entries are removed from that file.~~
- [ ] ~~Any patches that are no longer applied are deleted from the
port's directory.~~
- [x] The version database is fixed by rerunning `./vcpkg x-add-version
--all` and committing the result.
- [x] Only one version is added to each modified port's versions file.

---------

Co-authored-by: jim wang <122244446+jimwang118@users.noreply.github.com>

ports/libiconv/portfile.cmake

@@ -50,19 +50,10 @@ file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/share/${PORT}") # share contains un
 
 # Please keep, the default usage is broken
 file(INSTALL "${CMAKE_CURRENT_LIST_DIR}/usage" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}")
-file(READ "${SOURCE_PATH}/COPYING.LIB" copying_lib)
-file(READ "${SOURCE_PATH}/COPYING" copying_tool)
-file(WRITE "${CURRENT_PACKAGES_DIR}/share/${PORT}/copyright" "
+
+# Handle copyright
+vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/COPYING.LIB" "${SOURCE_PATH}/COPYING" COMMENT "
 The libiconv and libcharset libraries and their header files are under LGPL,
 see COPYING.LIB below.
 
-The iconv program and the documentation are under GPL, see COPYING below.
-
-# COPYING.LIB
-
-${copying_lib}
-
-# COPYING
-
-${copying_tool}
-")
+The iconv program and the documentation are under GPL, see COPYING below.")

ports/libiconv/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "libiconv",
   "version": "1.17",
-  "port-version": 2,
+  "port-version": 3,
   "description": "GNU Unicode text conversion",
   "homepage": "https://www.gnu.org/software/libiconv/",
   "license": null

versions/baseline.json

@@ -4474,7 +4474,7 @@
     },
     "libiconv": {
       "baseline": "1.17",
-      "port-version": 2
+      "port-version": 3
     },
     "libics": {
       "baseline": "1.6.6",

versions/l-/libiconv.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "0d6e7ebdbfeca59f047e66f632d1d38c2659fc14",
+      "version": "1.17",
+      "port-version": 3
+    },
     {
       "git-tree": "6103c3aaaf279f20df4c758fd25d5954c8582cbd",
       "version": "1.17",