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/time.c

@@ -0,0 +1,73 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/times.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "util.h"
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-p] cmd [arg ...]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	pid_t pid;
+	struct tms tms; /* user and sys times */
+	clock_t r0, r1; /* real time */
+	long ticks;     /* per second */
+	int status, savederrno, ret = 0;
+
+	ARGBEGIN {
+	case 'p':
+		break;
+	default:
+		usage();
+	} ARGEND
+
+	if (!argc)
+		usage();
+
+	if ((ticks = sysconf(_SC_CLK_TCK)) <= 0)
+		eprintf("sysconf _SC_CLK_TCK:");
+
+	if ((r0 = times(&tms)) == (clock_t)-1)
+		eprintf("times:");
+
+	switch ((pid = fork())) {
+	case -1:
+		eprintf("fork:");
+	case 0:
+		execvp(argv[0], argv);
+		savederrno = errno;
+		weprintf("execvp %s:", argv[0]);
+		_exit(126 + (savederrno == ENOENT));
+	default:
+		break;
+	}
+	waitpid(pid, &status, 0);
+
+	if ((r1 = times(&tms)) == (clock_t)-1)
+		eprintf("times:");
+
+	if (WIFSIGNALED(status)) {
+		fprintf(stderr, "Command terminated by signal %d\n",
+		        WTERMSIG(status));
+		ret = 128 + WTERMSIG(status);
+	}
+
+	fprintf(stderr, "real %f\nuser %f\nsys %f\n",
+	        (r1 - r0)      / (double)ticks,
+	        tms.tms_cutime / (double)ticks,
+	        tms.tms_cstime / (double)ticks);
+
+	if (WIFEXITED(status))
+		ret = WEXITSTATUS(status);
+
+	return ret;
+}