OPENOCD: allow empty commit

Sometimes the source directory is not cleaned but
everything is already committed. Then, git commit will fail
and so the build. Allow empty commit to bypass that issue.

Change-Id: Ib9b98dfc1b27ae74d32195b0e0e6e5aca7dd1f30
Signed-off-by: Lionel VITTE <lionel.vitte@st.com>

recipes-devtools/openocd/openocd-stm32mp_0.11.0.bb

@@ -19,5 +19,5 @@ SRC_URI += ""
 # To be removed after a new jimtcl release get used by openocd.
 do_configure:prepend() {
 	git add jimtcl
-	git commit -m "Update jimtcl"
+	git commit --allow-empty -m "Update jimtcl"
 }