Merge pull request #351 from grauehaare/master

New Package: pwgen-2.06, Passwordgenerator
New package: moon-buggy-1.0.51
base-system: remove ifenslave and bridge-utils; use ip(8) instead.
pam: disable cracklib and more stuff we don't use.
util-linux: disable pam_cracklib.
shadow: disable pam_cracklib.
openssh: enable PIE, disable kerberos and pam_cracklib.
shadow: disable nls.
man-db: use bdb rather than gdbm; remove localized manpages.
dosfstools: drop localized manpages and useless doc files.
fakeroot: drop localized manpages.
sudo: enable PIE.
base-directories: use ARCH in INSTALL script rather than uname.
xbps-src: use default hostdir if unset; added support for x86 chroots ootb.

- If -H (hostdir) is unset, it now defaults to xbps-packages/hostdir. This way
  a single hostdir can be shared by multiple masterdirs without any tweak.

- If bootstrap pkg are installed via 'binary-bootstrap arch', add support to
  reexec xbps-src with linux32 to allow 32bit builds without any tweak or
  additional commands.
chroot-gcc: fix x86_64 musl triplet.
bison: m4 must be in makedepends.
binutils: remove unnecessary makedepends.
xbps-src: add default local repo for the binary-bootstrap target.
Manual.md: sync with reality.
xbps-src: improve -r description.