scripts/setlocalversion: Reinstate .scmversion support

The .scmversion is used by oe-core to append U-Boot version string.

LOCALVERSION is not fully compatible replacement as it adds trailing
"-dirty" string at the end of version string in case the U-Boot git
tree contains uncommitted changes. This behavior itself is correct.
However, OE builds do clone U-Boot sources from git and may apply
additional patches on top, which are not tracked in U-Boot git tree,
but rather in the OE metalayer git tree, which leads to the addition
of "-dirty" string as well.

The .scmversion used by oe-core used to replace the version string
suffix fully, including the "-dirty" string. Reinstate support for
the .scmversion to let OE core do exactly that as it used to do it.

Fixes: 5c02350fa0 ("scripts/setlocalversion: sync with linux v6.9")
Signed-off-by: Marek Vasut <marex@denx.de>

scripts/setlocalversion

@@ -48,6 +48,10 @@ scm_version()
 	done
 
 	cd "$srctree"
+	if test -e .scmversion; then
+		cat .scmversion
+		return
+	fi
 
 	if test -n "$(git rev-parse --show-cdup 2>/dev/null)"; then
 		return