chore, hygiene, gen .x/.xh from .ggo

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, update to latest sxe-compiler macro package

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, lose the EXTRA_CFLAGS in src/Makefile.am

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

* bld/hygiene:
  chore, lose the EXTRA_CFLAGS in src/Makefile.am
  chore, update to latest sxe-compiler macro package
  chore, hygiene, gen .x/.xh from .ggo