[Chapel Merge] Adjust make docs to try to build compiler docs

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Branch: refs/heads/main
Revision: ac72d7e
Author: mppf
Log Message:

Merge pull request #18519 from mppf/make-docs-build-compiler-docs

Adjust make docs to try to build compiler docs

This PR adjusts make docs so that it attempts to build the compiler
library documentation. This documentation has additional requirements
(cmake, doxygen) beyond the other documentation. However, we would like
for make docs to build all of the documentation.

If the attempt to build the compiler library documentation fails but the
docs build was otherwise successful, a note is printed at the end of the
make docs output.

To get a complete docs build, one should install a recent enough doxygen
and cmake.

For https://github.com/Cray/chapel-private/issues/2565

Reviewed by @lydia-duncan and @Maxrimus - thanks!