asterisk-13.x: bump to 13.19.2

asterisk-13.x: bump to 13.19.2

No new features in this release. This is a bugfix release.

- Fixes:
    AST-2018-004
    AST-2018-005

- Remove res_pjsip_transport_management.so as it got moved into
  res_pjsip's core as per AST-2018-003.

- Change to PKG_HASH.

- Remove 003-disable-ast-xml-docs.patch, it doesn't apply anymore.
  Instead change --enable-xmldoc into --disable-xmldoc in the Makefile.

- Refreshed patches.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>