Stripping debugging information does not flow with CRAN

[Blunde1]

The CRAN policy contains

- Packages should not attempt to disable compiler diagnostics, nor to
remove other diagnostic information such as symbols in shared objects.

yet packages

MatchIt agtboost briskaR kgrams matrixprofiler prospectr resemble
strucchangeRcpp

attempt to do so.

Do correct before 2021-11-26 to safely retain your package on CRAN, and
as this will require manual check, do allow time for the CRAN
submissions team to do so.

Suggestions:

• Comment on https://stackoverflow.com/questions/46280628/object-files-in-r-package-too-large-rcpp
• Remove part of Makevars
• Submit 0.9.3 to CRAN and explain NOTE due to large .so file
• Include comment from prof Brian Ripley