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/uniq.1

@@ -0,0 +1,45 @@
+.Dd October 8, 2015
+.Dt UNIQ 1
+.Os sbase
+.Sh NAME
+.Nm uniq
+.Nd report or filter out repeated lines in a file
+.Sh SYNOPSIS
+.Nm
+.Op Fl c
+.Op Fl d | u
+.Op Fl f Ar num
+.Op Fl s Ar num
+.Op Ar input Op Ar output
+.Sh DESCRIPTION
+.Nm
+reads the
+.Ar input
+file and writes one copy of a line from each group of consecutive
+duplicate lines to the
+.Ar output
+file.
+If no
+.Ar input
+file is given
+.Nm
+reads from stdin.
+If no
+.Ar output
+file is given
+.Nm
+writes to stdout.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl c
+Prefix each line with the number of consecutive occurrences in
+.Ar input .
+.It Fl d | Fl u
+Print duplicate | unique lines only.
+.It Fl f Ar num | Fl s Ar num
+Ignore the first
+.Ar num
+fields | characters in each input line when doing comparisons.
+.El
+.Sh STANDARDS
+POSIX.1-2013.