[evolution-data-server] Remove outdated and unused devel-docs files from camel

[Milan Crha <mcrha src gnome org>]

commit e73cd1b810b27c9bdde7ed664c0fc132ae8f331e
Author: Milan Crha <mcrha redhat com>
Date:   Tue Feb 4 11:25:31 2020 +0100

    Remove outdated and unused devel-docs files from camel

 src/camel/devel-docs/camel-index.txt         | 407 ---------------------------
 src/camel/devel-docs/camel_data_wrapper.dia  | Bin 3062 -> 0 bytes
 src/camel/devel-docs/camel_parser_states.dia | Bin 2505 -> 0 bytes
 src/camel/devel-docs/camel_stream.dia        | Bin 2669 -> 0 bytes
 4 files changed, 407 deletions(-)