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/libutf/isspacerune.c

@@ -0,0 +1,31 @@
+/* Automatically generated by mkrunetype.awk */
+#include <stdlib.h>
+
+#include "../utf.h"
+#include "runetype.h"
+
+static const Rune space2[][2] = {
+	{ 0x0009, 0x000D },
+	{ 0x001C, 0x0020 },
+	{ 0x2000, 0x200A },
+	{ 0x2028, 0x2029 },
+};
+
+static const Rune space1[] = {
+	0x0085,
+	0x00A0,
+	0x1680,
+	0x202F,
+	0x205F,
+	0x3000,
+};
+
+int
+isspacerune(Rune r)
+{
+	if(bsearch(&r, space2, nelem(space2), sizeof *space2, &rune2cmp))
+		return 1;
+	if(bsearch(&r, space1, nelem(space1), sizeof *space1, &rune1cmp))
+		return 1;
+	return 0;
+}