apache2: drop unneeded workaround for apr/apr-util config script issue

The fix for the apr-1-config/apu-1-config path issue has been in OE-Core
for some time now (OE-Core commit
ab56f1063a666df5faddd97f44758c8ae378e51c) so we no longer need these
workarounds.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>