minor, refactor mmap tests into sxe-mmap macro package

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, use SXE_ as prefix for specific mmap tests as ...

they might be useful on their own.

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'bld/mac'

* bld/mac:
  chore, use SXE_ as prefix for specific mmap tests as ...
  minor, refactor mmap tests into sxe-mmap macro package