config/git: import suckless sbase

i currently use the output of sha512sum in several
places of xbmk, which is a bit unreliable in case
output changes.

other cases where i use util outputs in variables
are probably reliable, because i'm using mostly
posix utilities in those.

to mitigate this, i now import suckless sbase, which
has a reasonable sha512sum implementation.

*every* binary it builds is being placed in build.list,
because i'll probably start using more of them.

for example, i may start modifying the "date"
implementation, adding the GNU-specific options that
i need as mentioned on init.sh

i'm importing it in util/ because the sha512sum
util is needed for verifying project sources, so
if sbase itself is a "project source", that means
we can into a chicken and egg bootstrapping problem.

this is sbase at revision:
055cc1ae1b3a13c3d8f25af0a4a3316590efcd48

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/sbase/mknod.1

@@ -0,0 +1,44 @@
+.Dd February 2, 2015
+.Dt MKNOD 1
+.Os sbase
+.Sh NAME
+.Nm mknod
+.Nd create a special device file
+.Sh SYNOPSIS
+.Nm
+.Op Fl m Ar mode
+.Ar name
+.Cm b Ns | Ns Cm c Ns | Ns Cm u
+.Ar major
+.Ar minor
+.Nm
+.Op Fl m Ar mode
+.Ar name
+.Cm p
+.Sh DESCRIPTION
+.Nm
+creates a special file named
+.Ar name .
+.Pp
+The following special file types are supported:
+.Bl -tag -width Ds
+.It Cm b
+A block device.
+.It Cm c | u
+A character device.
+.It Cm p
+A named pipe.
+.El
+.Pp
+Block and character devices are created with major number
+.Ar major ,
+and minor number
+.Ar minor .
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl m
+Set the mode of the new file based on the octal value of
+.Ar mode .
+.El
+.Sh SEE ALSO
+.Xr mknod 2