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/xinstall.1

@@ -0,0 +1,86 @@
+.Dd December 3, 2016
+.Dt INSTALL 1
+.Os sbase
+.Sh NAME
+.Nm install
+.Nd copy files and set attributes
+.Sh SYNOPSIS
+.Nm
+.Op Fl g Ar group
+.Op Fl o Ar owner
+.Op Fl m Ar mode
+.Po
+.Fl d Ar dir ...
+|
+.Op Fl D
+.Po
+.Fl t Ar dest
+.Ar source ...
+|
+.Ar source ...
+.Ar dest
+.Pc
+.Pc
+.Sh DESCRIPTION
+.Nm
+copies
+.Ar source
+to
+.Ar dest .
+If more than one
+.Ar source
+is given
+.Ar dest
+is treated as a directory.
+Otherwise
+.Ar dest
+is treated as a filename.
+.Nm
+can also change the attributes of the copies.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl d
+Create the directories
+.Ar dir .
+.It Fl D
+Create missing parent directories to
+.Ar dest .
+If
+.Ar dest
+is to be treated as a directory, it is created too if missing.
+.It Fl g Ar group
+Change the installed files' group to
+.Ar group .
+This may be a group name or a group identifier.
+.It Fl m Ar mode
+Change the file modes.
+Both numerical and symbolic values are supported.
+See
+.Xr chmod 1
+for the syntex.
+Default mode 0755.
+If a file has the mode 0644 and is copied with
+.It Fl o Ar owner
+Change the installed files' owner to
+.Ar owner .
+This may be a user name or a user identifier.
+.It Fl t Ar dest
+Copy files into the directory
+.Ar dest .
+.Nm install ,
+the copy's mode will be 0755 unless
+.Fl m
+is used to select another mode.
+When the symbolic notation is used, the base mode is 0000.
+.El
+.Sh SEE ALSO
+.Xr chmod 1 ,
+.Xr chown 1 ,
+.Xr cp 1 ,
+.Xr mkdir 1
+.Sh STANDARDS
+The
+.Nm
+utility is not standardized.
+This implementation is a subset of the GNU implementation and a subset
+with extensions to the FreeBSD implementation.