[project] Remove unused cpptoml external

The cpptoml library was used by the initrd tooling, but is no longer
needed.

other_software.md

@@ -33,32 +33,6 @@ Boost Software license:
 > ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 > DEALINGS IN THE SOFTWARE.
 
-## cpptoml
-
-jsix uses the [cpptoml][] library for parsing TOML configuration files. cpptoml
-is released under the terms of the MIT license:
-
-[cpptoml]: https://github.com/skystrife/cpptoml
-
-> Copyright (c) 2014 Chase Geigle
->
-> Permission is hereby granted, free of charge, to any person obtaining a copy of
-> this software and associated documentation files (the "Software"), to deal in
-> the Software without restriction, including without limitation the rights to
-> use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-> the Software, and to permit persons to whom the Software is furnished to do so,
-> subject to the following conditions:
-> 
-> The above copyright notice and this permission notice shall be included in all
-> copies or substantial portions of the Software.
-> 
-> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-> FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-> COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-> IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-> CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
 ## printf
 
 jsix uses Marco Paland's tiny [printf][] library for its `*printf()` functions,