[CMake] INSTALL EXPORT for Debug and Release

[Justin Berger]

With two build directories -- one for release and one for debug -- using
the Makefile generator, it seems like calling one 'make install' replaces
out the export files for the other with the message:

> Old export file "<project>.cmake" will be replaced.  Removing files
[<project>-debug.cmake]

The INSTALL snippet just looks like:

> install(EXPORT <project> DESTINATION lib/<project>)

The question is, is it possible to use a single config generator like
Makefiles to install both a working release and debug version of a library?
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