Since parser test requirements are per-file, move the smoke test which
requires `{{#ifeq}}` (from [[mw:Extension:ParserFunctions]]) into its
own file and define the requirement properly in the file header.
That avoids spurious parser test failures if developers don't have
the ParserFunctions extension installed locally.
Change-Id: Ia5ffbe0896d5033fe2da526e42bf111edbc56adf
