perl5 @5.22.2: build_arch and universal not fully respected

[MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)]

The .bundle files are not built with arch flags, so they do not respect build_arch and are not built universal.
Attached are several proposed solutions.

• Portfile1.diff adds -Alddlflags="$LDFLAGS" to configure.post_args. It adds the arch flags, but it also adds -L/opt/local/lib -Wl,-headerpad_max_install_names, which might not be desirable.

• Portfile2.diff and Portfile2.diff just add "-Alddlflags=\"[get_canonical_archflags ld]\"" to configure.post_args. Extra code, however, is required to make get_canonical_archflags work correctly. get_canonical_archflags determines if universal flags are required using the following code:

  	if {![variant_exists universal] || ![variant_isset universal]} {
  

When configure.post_args-append is run, however, the universal variant has not yet been created. I assume this is to give the Portfile a chance to create its own.