cppmanifest: Invalid URL as dependency

[sbowman-mitre]

FMACM/CMakeLists.txt

Line 35 in d606028

GIT_REPOSITORY https://mustache.mitre.org/scm/idea/cppmanifest.git

This URL is not available to GitHub users & build processes, causing a build failure.

[sbowman-mitre]

The original project is open source: buffetboy2001/cppmanifest.

However, MITRE has an internal project with significant maturation relative to the current one on GH. MITRE will be releasing its updated repo to GitHub in late 2025.

Post back here for updates and questions.