Convert to new override syntax

This is the result of automated script (0.9.1) conversion:

oe-core/scripts/contrib/convert-overrides.py .

converting the metadata to use ":" as the override character instead of "_".

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/devmem2/devmem2.bb

@@ -11,7 +11,7 @@ S = "${WORKDIR}"
 
 CFLAGS += "-DFORCE_STRICT_ALIGNMENT"
 
-python do_unpack_append() {
+python do_unpack:append() {
     os.rename("devmem2-new.c", "devmem2.c")
 }