picolibc: Use zephyr-source branch

keith-packard · stephanosio · commit ccef521cdba0 · 2023-05-26T00:38:12.000+09:00
This branch has support for _ZEPHYR_SOURCE

Signed-off-by: Keith Packard &lt;keithp@keithp.com&gt;
diff --git a/picolibc b/picolibc
@@ -1 +1 @@
-Subproject commit 93b5d5f2ad44867b60267417cd6d6250dbf68983
+Subproject commit dc780962322dbaf2b326305f312721ea8cf7c265
