fix: CMake Fixes to Make it Compatible with Latest Aws-c-common

[waahm7]

Description of changes:
Hi, I am from the Common Runtime team and we own https://github.com/awslabs/aws-c-common. We recently did some cleanup in CMake, in aws-c-common at awslabs/aws-c-common#1178. This broke this repository because it was relying on aws-c-common to set LIBRARY_DIRECTORY and RUNTIME_DIRECTORY, which aws-c-common no longer does. This PR updates aws-encryption-sdk-c to now use the official CMake variables like aws-c-common.
Changes:

• Respect CMAKE_INSTALL_LIBDIR, CMAKE_INSTALL_BINDIR, CMAKE_INSTALL_INCLUDEDIR
  • Use these variables directly, instead of defining our own (LIBRARY_DIRECTORY, RUNTIME_DIRECTORY)
  • include(GNUInstallDirs) on all platforms
  • REASONING: This removes a bunch of boilerplate, and makes it obvious we should defer to CMake for install directory names. I assume the original author thought GNUInstallDirs wasn't safe for Windows and Apple, but despite its name, it's fine. Professional CMake says:

    CMake’s GNUInstallDirs module provides a very convenient way to use a standard directory layout. ... it also provides various other standard locations that conform to both GNU coding standards and the FHS. ... the layout can even be used for Windows deployments

We can improve the CMake further like we did in aws-c-common, which will also fix #811, but I have decided to keep this PR simple, so that it is easier to review and merge.

• macOS-11 is no longer available, use the minimum macOS-13 github runner.
• Use macos-latest-large which is the Intel based runner instead of macos-latest which is now arm based.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Check any applicable:

• Were any files moved? Moving files changes their URL, which breaks all hyperlinks to the files.

[graebm]

LGTM (I had made the changes to aws-c-common)

[ajewellamz]

Looks good to me.