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/touch.1

@@ -0,0 +1,63 @@
+.Dd October 8, 2015
+.Dt TOUCH 1
+.Os sbase
+.Sh NAME
+.Nm touch
+.Nd set file timestamps
+.Sh SYNOPSIS
+.Nm
+.Op Fl acm
+.Op Fl d Ar time | Fl r Ar ref_file | Fl T Ar time | Fl t Ar time
+.Ar file ...
+.Sh DESCRIPTION
+.Nm
+sets the access and modification time of each
+.Ar file
+to the current time of day.
+If
+.Ar file
+doesn't exist, it is created with default permissions.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl a | Fl m
+Set the access | modification time of
+.Ar file .
+.It Fl c
+Don't create
+.Ar file
+if it doesn't exist, not affecting exit status.
+.It Fl d Ar time
+Set the
+.Ar time
+of the format YYYY-MM-DDThh:mm:SS[Z] used for
+.Op Fl am .
+.It Fl r Ar ref_file
+Set the
+.Ar time
+used for
+.Op Fl am
+to the modification time of
+.Ar ref_file .
+.It Fl T Ar time
+Set the
+.Ar time
+used for
+.Op Fl am
+given as the number of seconds since the
+Unix epoch 1970-01-01T00:00:00Z.
+.It Fl t Ar time
+Set the
+.Ar time
+of the format [[CC]YY]MMDDhhmm[.SS] used for
+.Op Fl am .
+.El
+.Sh SEE ALSO
+.Xr date 1
+.Sh STANDARDS
+POSIX.1-2013.
+Except for fractional seconds with
+.Op Fl d .
+.Pp
+The
+.Op Fl T
+flag is an extension to that specification.