Revert "fs/dcache.c: adaptive vfs_cache_pressure on suspend / resume"

This reverts commit 965c400c2eb779f16ec1bbde09b4f385ce8b5956.
Revert "block: recursive merge requests"

This reverts commit 487ff47830cf949ddd28ab504ce7e13d77e42e08.
Revert "swap: allow swap readahead to be merged"

This reverts commit 7b0ac1feef086eb44c522d6a6a9df8a4bba6642e.
Revert "lib/string: use glibc version"

This reverts commit 709c850c1212fd5a309696871800526981867997.
Revert "lib/memcopy: use glibc version"

This reverts commit 9734d2474ba270f8145cd647913d3d5bd3392438.