`make install` erroring when building with `-DBUILD_TESTS=OFF`

[asymmetric]

I ran the following command in a debian-testing:slim docker image:

root@6f6b2a4cfeb4:/lib-ledger-core-build# cmake -DBUILD_TESTS=OFF  ../lib-ledger-core && make

After that, I ran make install from the same build directory, which failed with:

root@6f6b2a4cfeb4:/lib-ledger-core-build# make install
[  1%] Built target secp256k1
[  1%] Built target bigd
[  1%] Built target fmt
[ 58%] Built target crypto
[ 58%] Built target blake
[ 58%] Built target ethash
[ 58%] Built target snappy
[ 62%] Built target leveldb
[ 62%] Built target sha512256
[ 63%] Built target sqlcipher
[ 65%] Built target soci_core_static
[ 66%] Built target soci_sqlite3
Consolidate compiler generated dependencies of target ledger-core-obj
[100%] Built target ledger-core-obj
[100%] Built target ledger-core
[100%] Built target ledger-core-static
Install the project...
-- Install configuration: "Release"
-- Installing: /usr/local/include/openssl/e_os2.h
-- Installing: /usr/local/share/openssl/c_hash
-- Installing: /usr/local/share/openssl/c_info
-- Installing: /usr/local/share/openssl/c_issuer
-- Installing: /usr/local/share/openssl/c_name
CMake Error at core/lib/openssl/cmake_install.cmake:50 (file):
  file INSTALL cannot find
  "/lib-ledger-core/core/lib/openssl/tools/c_rehash": No such file or
  directory.
Call Stack (most recent call first):
  core/lib/cmake_install.cmake:57 (include)
  core/cmake_install.cmake:47 (include)
  cmake_install.cmake:52 (include)


make: *** [Makefile:130: install] Error 1

It seems the install target is trying to install openssl, which IIUC has explicitly been excluded from the build by the BUILD_TESTS=OFF flag.