patchcmake: fix build of `t-oidtree`

> From: Johannes Schindelin <johannes.schindelin@gmx.de>
>
> When the `oidtree` test helper was turned into a unit test, a new
> `lib-oid` source file was added as dependency. This was only done in the
> Makefile so far, but also needs to be done in the CMake definition.
>
> This is a companion of ed548408723d (t/: migrate helper/test-oidtree.c
> to unit-tests/t-oidtree.c, 2024-06-08).
>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
>     cmake: fix build of t-oidtree
>
>     This is based on the gt/unit-test-oidtree branch.
>
>     /cc "Ghanshyam Thakkar" shyamthakkar001@gmail.com
>
> Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1761%2Fdscho%2Fcmake-vs-t-oidtree-v1
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1761/dscho/cmake-vs-t-oidtree-v1
> Pull-Request: https://github.com/gitgitgadget/git/pull/1761
>
>  contrib/buildsystems/CMakeLists.txt | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/contrib/buildsystems/CMakeLists.txt b/contrib/buildsystems/CMakeLists.txt
> index 2f9c33585c6..832f46b316b 100644
> --- a/contrib/buildsystems/CMakeLists.txt
> +++ b/contrib/buildsystems/CMakeLists.txt
> @@ -976,11 +976,12 @@ list(TRANSFORM test-reftable_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/")
>
>  #unit-tests
>  add_library(unit-test-lib OBJECT ${CMAKE_SOURCE_DIR}/t/unit-tests/test-lib.c)
> +add_library(unit-test-lib-oid OBJECT ${CMAKE_SOURCE_DIR}/t/unit-tests/lib-oid.c)
>
>  parse_makefile_for_scripts(unit_test_PROGRAMS "UNIT_TEST_PROGRAMS" "")
>  foreach(unit_test ${unit_test_PROGRAMS})
>  	add_executable("${unit_test}" "${CMAKE_SOURCE_DIR}/t/unit-tests/${unit_test}.c")
> -	target_link_libraries("${unit_test}" unit-test-lib common-main)
> +	target_link_libraries("${unit_test}" unit-test-lib unit-test-lib-oid common-main)
>  	set_target_properties("${unit_test}"
>  		PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/t/unit-tests/bin)
>  	if(MSVC)
>
> base-commit: ed548408723d6e969160279398cc47f88f5700bc
> --
> gitgitgadget
>

> From: Johannes Schindelin <johannes.schindelin@gmx.de>
>
> When the `oidtree` test helper was turned into a unit test, a new
> `lib-oid` source file was added as dependency. This was only done in the
> Makefile so far, but also needs to be done in the CMake definition.
>
> This is a companion of ed548408723d (t/: migrate helper/test-oidtree.c
> to unit-tests/t-oidtree.c, 2024-06-08).
>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
>     cmake: fix build of t-oidtree
>     
>     This is based on the gt/unit-test-oidtree branch.
>     
>     /cc "Ghanshyam Thakkar" shyamthakkar001@gmail.com

> "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>
> writes:
>
> > From: Johannes Schindelin <johannes.schindelin@gmx.de>
> >
> > When the `oidtree` test helper was turned into a unit test, a new
> > `lib-oid` source file was added as dependency. This was only done in the
> > Makefile so far, but also needs to be done in the CMake definition.
> >
> > This is a companion of ed548408723d (t/: migrate helper/test-oidtree.c
> > to unit-tests/t-oidtree.c, 2024-06-08).
> >
> > Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> > ---
> >     cmake: fix build of t-oidtree
> >     
> >     This is based on the gt/unit-test-oidtree branch.
> >     
> >     /cc "Ghanshyam Thakkar" shyamthakkar001@gmail.com
>
> The base topic has been merged last month during this cycle, so the
> fix must be merged down to the 'master' before the release. Will
> queue.

> Changes look correct to me. I was not aware of the existance of
> CMakeLists in the tree cause there was no mention of CMake support
> in the docs about building git from source, but it was my mistake
> for grepping for 'test-lib' in just the Makefile instead of project
> wide. Apologies for the negligance and thanks for the patch.

> Junio C Hamano <gitster@pobox.com> wrote:
> > "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>
> > writes:
> >
> > > From: Johannes Schindelin <johannes.schindelin@gmx.de>
> > >
> > > When the `oidtree` test helper was turned into a unit test, a new
> > > `lib-oid` source file was added as dependency. This was only done in the
> > > Makefile so far, but also needs to be done in the CMake definition.
> > >
> > > This is a companion of ed548408723d (t/: migrate helper/test-oidtree.c
> > > to unit-tests/t-oidtree.c, 2024-06-08).
> > >
> > > Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> > > ---
> > >     cmake: fix build of t-oidtree
> > >
> > >     This is based on the gt/unit-test-oidtree branch.
> > >
> > >     /cc "Ghanshyam Thakkar" shyamthakkar001@gmail.com
> >
> > The base topic has been merged last month during this cycle, so the
> > fix must be merged down to the 'master' before the release. Will
> > queue.
>
> Changes look correct to me.