classes: Drop ';' delimiter from ROOTFS/IMAGE*COMMAND variables

Originally these were shell functions but they have long since been processed by
bb.build.exec_func(). Since we no longer need shell syntax, we can drop the ';'
delimiters and just use a space separated string.

This cleans up the variable and quietly removes any stray ';' that do happen to
still make it in.

(From OE-Core rev: c3365dfd9ddd7fbe70b62e0f11166e57a8ca6f73)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/utils.py

@@ -258,11 +258,11 @@ def execute_pre_post_process(d, cmds):
     if cmds is None:
         return
 
-    for cmd in cmds.strip().split(';'):
-        cmd = cmd.strip()
-        if cmd != '':
-            bb.note("Executing %s ..." % cmd)
-            bb.build.exec_func(cmd, d)
+    cmds = cmds.replace(";", " ")
+
+    for cmd in cmds.split():
+        bb.note("Executing %s ..." % cmd)
+        bb.build.exec_func(cmd, d)
 
 # For each item in items, call the function 'target' with item as the first 
 # argument, extraargs as the other arguments and handle any exceptions in the