No need for CMake to specify locations of individual packages

[cmb69]

For instance, we have

winlib-builder/.github/workflows/libzip.yml

Line 45 in 241fabb

run: cd libzip && md build && cd build && cmake -G "Visual Studio 17 2022" -A ${{steps.virtuals.outputs.msarch}} -T ${{steps.virtuals.outputs.msts}} -DZLIB_INCLUDE_DIR:PATH=${{github.workspace}}\deps\include -DZLIB_LIBRARY:PATH=${{github.workspace}}\deps\lib\zlib_a.lib -DBZIP2_INCLUDE_DIR:PATH=${{github.workspace}}\deps\include -DBZIP2_LIBRARIES:PATH=${{github.workspace}}\deps\lib\libbz2_a.lib -DLIBLZMA_INCLUDE_DIR:PATH=${{github.workspace}}\deps\include -DLIBLZMA_LIBRARY:PATH=${{github.workspace}}\deps\lib\liblzma_a.lib -DBUILD_TOOLS=OFF -DBUILD_REGRESS=OFF -DBUILD_EXAMPLES=OFF -DBUILD_DOC=OFF ..

It should be possible to just use -DCMAKE_INCLUDE_PATH and -DCMAKE_LIBRARY_PATH instead.