gringo: fix build on pre-10.9 clang

Closes #27893.
gringo: upstream patch to build on FSF GCCs
android-sdk: use install_symlink
neko: use install_symlink
nginx: move location-dependent things to post_install
Update to ejabberd 13.12

Update to ejabberd 13.12
- includes PostgreSQL support option
- includes MySQL support option
- can be built with Homebrew OpenSSL 1.0.1f and later (for TLS v1.1 and TLS v1.2 support)
Update to ejabberd 13.12

made Homebrew OpenSSL support unconditional.
Update to ejabberd 13.12

Fixed installation
Update to ejabberd 13.12

Fixed LDFLAGS and CPPFLAGS.
Update ejabberd.rb
ejabberd: add 13.12 bottle.