CMake skip building examples/tests/running tests and installing files? (As submodule)

[MrSapps]

When using this repo as a submodule I'd like to just build the static lib/dll/so. Is there a way to disable:

-Building example binaries
-Adding/running test (the example binaries)
-Installing files

I noticed there seems to be a skip var for each install section?

if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
install(FILES ${ZLIB_PUBLIC_HDRS} DESTINATION "${INSTALL_INC_DIR}")
endif()

[danielalves]

I created a PR that partially solves this issue: #824