stdlib: adjust the name for static libraries on Windows

Windows names static libraries with a `lib` prefix and a `lib` suffix.
This differentiates them from the import libraries which have no prefix
and a `lib` suffix.  This adjustment enables the parallel installation
of import libraries and static library variants for a given module.
This is required to support static and dynamic library co-existence in
Swift.

Author: compnerd

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -1080,6 +1080,10 @@ function(add_swift_target_library_single target name)
       target_include_directories("${target}" SYSTEM PRIVATE
         ${SWIFTLIB_INCLUDE})
     endif()
+    if(libkind STREQUAL STATIC)
+      set_property(TARGET "${target}" PROPERTY
+        PREFIX lib)
+    endif()
   endif()
 
   if("${SWIFTLIB_SINGLE_SDK}" STREQUAL "WINDOWS" AND NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")