[DO-978] openssl package (!8)

Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Reviewed-on: https://git.avroid.tech/Conan/conan_build/pulls/8

recipes/openssl/1.x.x/test_package/CMakeLists.txt

@@ -0,0 +1,31 @@
+cmake_minimum_required(VERSION 3.8)
+project(test_package C)
+
+option(OPENSSL_WITH_ZLIB "OpenSSL with zlib support" ON)
+
+set(OpenSSL_DEBUG 1)
+find_package(OpenSSL REQUIRED)
+
+# Test whether variables from https://cmake.org/cmake/help/latest/module/FindOpenSSL.html
+# are properly defined in conan generators
+set(_custom_vars
+    OPENSSL_FOUND
+    OPENSSL_INCLUDE_DIR
+    OPENSSL_CRYPTO_LIBRARY
+    OPENSSL_CRYPTO_LIBRARIES
+    OPENSSL_SSL_LIBRARY
+    OPENSSL_SSL_LIBRARIES
+    OPENSSL_LIBRARIES
+    OPENSSL_VERSION
+)
+foreach(_custom_var ${_custom_vars})
+    if(DEFINED ${_custom_var})
+        message(STATUS "${_custom_var}: ${${_custom_var}}")
+    else()
+        message(FATAL_ERROR "${_custom_var} not defined")
+    endif()
+endforeach()
+
+add_executable(${PROJECT_NAME} digest.c)
+target_link_libraries(${PROJECT_NAME} PRIVATE OpenSSL::SSL)
+target_compile_definitions(${PROJECT_NAME} PRIVATE $<$<BOOL:${OPENSSL_WITH_ZLIB}>:WITH_ZLIB>)