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/paste.1

@@ -0,0 +1,47 @@
+.Dd October 8, 2015
+.Dt PASTE 1
+.Os sbase
+.Sh NAME
+.Nm paste
+.Nd merge lines of files in parallel or sequentially
+.Sh SYNOPSIS
+.Nm
+.Op Fl s
+.Op Fl d Ar list
+.Ar file ...
+.Sh DESCRIPTION
+.Nm
+reads single lines from each
+.Ar file
+and writes them into one line, replacing
+.Sy \en
+with
+.Sy \et
+except from the last
+.Ar file .
+This process is repeated until each
+.Ar file
+is starved, treating zero-reads as empty lines along the way.
+.Pp
+If
+.Ar file
+is '-',
+.Nm
+interprets it as stdin.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl d Ar list
+Replace
+.Sy \en
+with escaped characters from
+.Ar list
+by cycling through it.
+.It Fl s
+Read each
+.Ar file
+sequentially instead of in parallel.
+.El
+.Sh SEE ALSO
+.Xr cut 1
+.Sh STANDARDS
+POSIX.1-2013.