Add --with-libgssapi_krb5 to match libsodium and pgm.
Add support for --with/--without libgssapi_krb5
Merge pull request #1226 from pmienk/master

Standardize optional libgssapi_krb5 dependency
Unbind socket with real endpoint when binding by wild-card * address
Pass --with/--without-libgssapi_krb5 to configure.
Correct libgssapi_krb5 packages.
Merge pull request #1231 from johntconklin/master

Pass --with/--without-libgssapi_krb5 to configure.
Support both --enable-eventfd and --disable-eventfd options.
Merge pull request #1232 from johntconklin/master

Support both --enable-eventfd and --disable-eventfd options.
Merge pull request #1229 from lysyloren/master

Unbind socket with real endpoint when binding by wild-card * address
Added test and updated documentation for unbind wild-card * binded socket
Merge pull request #1233 from lysyloren/master

Added test and updated documentation for unbind wild-card * binded socke...
Disable IPC testing on ipc-incapable systems in test_term_endpoint.cpp
Merge pull request #1234 from lysyloren/master

Disable IPC testing on ipc-incapable systems in test_term_endpoint.cpp