net/asterisk-13.x: bump to 13.17.0

net/asterisk-13.x: bump to 13.17.0

- Version bump to 13.17.0
- Remove makeopts.embed_rules as the target got removed.
- Refresh patches.
- $(STAGING_DIR)/host doesn't work anymore resulting in libxml2 host
  headers not being found. Replace with $(STAGING_DIR_HOSTPGK).
- Prevent Asterisk from adding -march=native when cross-compiling (patch
  for configure.ac).

Signed-off-by: Sebastian Kemper <[email protected]>