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/kill.1

@@ -0,0 +1,39 @@
+.Dd October 8, 2015
+.Dt KILL 1
+.Os sbase
+.Sh NAME
+.Nm kill
+.Nd signal processes
+.Sh SYNOPSIS
+.Nm
+.Op Fl s Ar signame | Fl num | Fl signame
+.Ar pid ...
+.Nm
+.Fl l Op Ar num
+.Sh DESCRIPTION
+.Nm
+signals TERM to each process or process group specified by
+.Ar pid .
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl l Op Ar num
+List all available signals or the signal name of
+.Ar num .
+.It Fl s Ar signame | Fl num | Fl signame
+Send signal corresponding to
+.Ar signame
+|
+.Ar num .
+The default is TERM.
+.El
+.Sh SEE ALSO
+.Xr kill 2 ,
+.Xr signal 7
+.Sh STANDARDS
+POSIX.1-2013.
+.Pp
+The
+.Fl Ar signame
+and
+.Fl Ar num
+syntax is marked by POSIX.1-2013 as an X/OPEN System Interfaces option.