build: do not build mksnapshot and mkcodecache for --shared

To build mkcodecache and mksnapshot (they are executables),
we currently build libnode with unresolved symbols, then build
the two exectuables with src/node_snapshot_stub.cc and
src/node_code_cache_stub.cc. Each of them write a C++ file to
disk when being run. We then use the generated C++ files & libnode
(with unresolved symbols) to build the final Node executable.

However, if libnode itself is the final product, then we should
not build it with unresolved symbols.
https://github.com/nodejs/node/pull/28897 added the two stubs
for the libnode target when the --shared configure option is used,
but it did not get rid of the actions to build and run mksnapshot
and mkcodecache for --shared, so to get it working we also
need a patch to make sure --shared imply --without-node-code-cache
and --without-node-snapshot, until we actually fix the TODO so that
mksnapshot and mkcodecache do not use the libnode that way.

PR-URL: https://github.com/nodejs/node/pull/30647
Refs: https://github.com/nodejs/node/issues/28845


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>