BUILD: Avoid installing some libraries with missing dependencies

  - Do not install library(prolog_pack) if http support is missing.
  - Do not install SICStus timeout compatibility if multi-threading is not enabled.

Author: JanWielemaker

src/CMakeLists.txt

@@ -182,7 +182,11 @@ endif()
 if(EMSCRIPTEN)
   list(APPEND SWIPL_DATA_library wasm.pl dom.pl)
 else()
-  list(APPEND SWIPL_DATA_library prolog_pack.pl git.pl www_browser.pl)
+  has_package(http HAVE_HTTP)
+  list(APPEND SWIPL_DATA_library git.pl www_browser.pl)
+  if(HAVE_HTTP)
+    list(APPEND prolog_pack.pl)
+  endif()
 endif()
 if(NOT STATIC_EXTENSIONS)
   list(APPEND SWIPL_DATA_library shlib.pl)
@@ -240,9 +244,15 @@ endif()
 if(NOT EMSCRIPTEN)
 list(APPEND SWIPL_DATA_library_unicode  unicode_data.pl)
 list(APPEND SWIPL_DATA_library_dialect_sicstus
-     sockets.pl	timeout.pl system.pl)
+     sockets.pl system.pl)
+if(MULTI_THREADED)
+  list(APPEND SWIPL_DATA_library_dialect_sicstus timeout.pl)
+endif()
 list(APPEND SWIPL_DATA_library_dialect_sicstus4
-     file_systems.pl sockets.pl	timeout.pl system.pl)
+     file_systems.pl sockets.pl system.pl)
+if(MULTI_THREADED)
+  list(APPEND SWIPL_DATA_library_dialect_sicstus4 timeout.pl)
+endif()
 list(APPEND SWIPL_DATA_app
      pack.pl splfr.pl)
 endif()
@@ -666,7 +676,7 @@ if(EPILOG AND APPLE)
   if(BUILD_MACOS_BUNDLE)
     install(FILES ${ICNS_FILE} DESTINATION ${SWIPL_INSTALL_RESOURCES})
   endif()
-endif()    
+endif()
 
 # Create cmake config files
 include(CMakePackageConfigHelpers)