e2fsprogs: Install libs to sysroot, progs to target

e2fsprogs is annoying in that the install-progs targets also want to
install man pages.  Manually delete them for now as making a patch to
avoid this is frustrating.
zlib: Set optimization in CFLAGS

No need to alter configure, it'll respect CFLAGS.
Add netplug to beyond-net

Includes a patch to fix build issues.
Not yet supported by bootscripts although instructions are in this
commit.