Optional support for configuring with pkg-config

[gahr]

As of neomutt/neomutt@f45c28e, we support a configure option to locate a subset of our 3rd party dependencies using pkg-config instead of our hand-built checks against header files and libraries. In particular cases, the switch enables using a dedicated program, e.g., gpgme-config.

This feature is disabled by default and can be enabled by passing --pkgconf to our ./configure script.

I kindly ask you to give the switch a try and report feedback related to the distributions you maintain.

3rd party dependencies that use a different config mechanism are currently:

• gpgme
• gpg-error
• libsasl2
• lua
• gnutls
• libidn
• libidn2
• kyotocabinet
• qdbm
• tokyocabinet

Thanks!