From: Johannes Schindelin <johannes.schindelin@gmx.de>

In the commit "git-std-lib: introduce Git Standard Library" of the
`cw/git-std-lib` topic, the Makefile was restructured in a manner that
requires the CMake definition to follow suit to be able to build Git.

This commit adjusts the CMake definition accordingly.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Submitted-As: https://lore.kernel.org/git/pull.1677.git.1709045045235.gitgitgadget@gmail.com