cmake: make retrieve_webindex conditional on OpenSSL like retrieve_anonftps

retrieve_webindex uses https.c (OpenSSL) for HTTPS site crawling but had
find_package(OpenSSL REQUIRED) at the subdirectory level, making OpenSSL
a hard build dependency for the entire project.  Changed to mirror the
pattern used for retrieve_anonftps: guard with if(OpenSSL_FOUND) so the
binary is skipped rather than failing the configure step when libssl-dev
is absent.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CMakeLists.txt

@@ -90,7 +90,7 @@ install(TARGETS
   ferretd weaseld
   ardomains convert_hostdb dump_hostdb dump_hostdb_ndbm
   db_build db_check db_dump db_reorder db_siteidx db_stats fix_start_db restore_hostdb
-  parse_webindex partial_webindex retrieve_webindex
+  parse_webindex partial_webindex
   extern_urls extern_urls_ndbm
   check_webindex delete_webindex insert_webindex net_webindex
   DESTINATION bin
@@ -102,6 +102,9 @@ endif()
 if(OpenSSL_FOUND AND TARGET retrieve_anonftps)
   install(TARGETS retrieve_anonftps DESTINATION bin)
 endif()
+if(OpenSSL_FOUND AND TARGET retrieve_webindex)
+  install(TARGETS retrieve_webindex DESTINATION bin)
+endif()
 if(TARGET host_manage)
   install(TARGETS host_manage DESTINATION bin)
 endif()

archie/webindex/retrieve/CMakeLists.txt

@@ -1,36 +1,36 @@
-find_package(OpenSSL REQUIRED)
+if(OpenSSL_FOUND)
+  add_executable(retrieve_webindex
+    do_retrieve.c
+    fileUrl.c
+    http.c
+    https.c
+    lang_retrieve.c
+    menu.c
+    parse.c
+    retrieve_web.c
+    robot.c
+    str.c
+    tcp.c
+    url.c
+    urldb.c
+  )
 
-add_executable(retrieve_webindex
-  do_retrieve.c
-  fileUrl.c
-  http.c
-  https.c
-  lang_retrieve.c
-  menu.c
-  parse.c
-  retrieve_web.c
-  robot.c
-  str.c
-  tcp.c
-  url.c
-  urldb.c
-)
+  target_link_libraries(retrieve_webindex PRIVATE
+    archie_config
+    anonftp
+    archiecore
+    archstridx
+    hostdb
+    patrie
+    startdb
+    webindexlib
+    OpenSSL::SSL
+    OpenSSL::Crypto
+  )
 
-target_link_libraries(retrieve_webindex PRIVATE
-  archie_config
-  anonftp
-  archiecore
-  archstridx
-  hostdb
-  patrie
-  startdb
-  webindexlib
-  OpenSSL::SSL
-  OpenSSL::Crypto
-)
-
-target_include_directories(retrieve_webindex PRIVATE
-  "${ARCHIE_ROOT}/include"
-  "${ARCHIE_ROOT}/webindex/lib"
-  "${CMAKE_CURRENT_SOURCE_DIR}"
-)
+  target_include_directories(retrieve_webindex PRIVATE
+    "${ARCHIE_ROOT}/include"
+    "${ARCHIE_ROOT}/webindex/lib"
+    "${CMAKE_CURRENT_SOURCE_DIR}"
+  )
+endif()