cmake, ctest, cpack: Delay-load Windows system libraries

`cmake.exe`, `ctest.exe` and `cpack.exe` import several Windows system
libraries directly, so the loader maps them, and the libraries they
depend on, every time one of the tools starts.  Many runs use none of
them, including most `cmake -E` commands, which run many times in
every build.

When building with MSVC or clang-cl, link the three tools with
`-DELAYLOAD` for these libraries so each one is loaded on first use.

Issue: #28164

.typos.toml

@@ -75,6 +75,8 @@ Fo = "Fo"
 ot = "ot"
 # Part of compiler executable name, e.g., `arm-unknown-nto-qnx6`, but also could be in a literal string.
 nto = "nto"
+# A Windows system library.
+secur = "secur"
 
 [type.cpp.extend-identifiers]
 APPENDed = "APPENDed"

Source/CMakeLists.txt

@@ -1445,6 +1445,19 @@ add_executable(cpack CPack/cpack.cxx)
 target_link_libraries(cpack PRIVATE CPackLib ManifestLib)
 list(APPEND _tools cpack)
 
+if(MSVC)
+  # Many runs of these tools, such as most "cmake -E" commands, use none
+  # of these system libraries.  Load them on first use instead of at
+  # start-up.
+  foreach(tool IN ITEMS cmake ctest cpack)
+    foreach(dll IN ITEMS bcrypt crypt32 dbghelp iphlpapi ole32 oleaut32
+                         powrprof psapi secur32 shell32 user32 ws2_32)
+      target_link_options(${tool} PRIVATE "-DELAYLOAD:${dll}.dll")
+    endforeach()
+    target_link_libraries(${tool} PRIVATE delayimp)
+  endforeach()
+endif()
+
 # Curses GUI
 if(BUILD_CursesDialog)
   add_subdirectory(CursesDialog)