Fixing install of headers when using an experimental feature #7202
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Trying to use the experimental sha256 feature via vcpkg I ran into this issue: #7199
So here I've made a small modification to the cmake script so that all header files in the include directory are updated to point at git2-experimental/. The target's install interface had to be modified so that it uses the unmodified include/ headers from the source tree to build but points the installed target to the modified, installed headers.
I verified that this worked by creating a custom vcpkg port and overriding our usage of libgit2 to point to this change. It built and installed without incident and our tool can now properly interact with sha256 repos as expected.