Depend on OpenSSL::Crypto and OpenSSL::SSL

Maybe only one is strictly required, but the list of headers used in
ns_turn_openssl.h includes things from both.

src/apps/common/CMakeLists.txt

@@ -37,6 +37,11 @@ if(hiredis_FOUND)
 else()
     list(APPEND COMMON_DEFINED TURN_NO_HIREDIS)
 endif()
+
+find_package(OpenSSL REQUIRED Crypto SSL)
+list(APPEND COMMON_LIBS OpenSSL::Crypto)
+list(APPEND COMMON_LIBS OpenSSL::SSL)
+
 message("COMMON_LIBS:${COMMON_LIBS}")
 
 add_library(${PROJECT_NAME} ${SOURCE_FILES} ${HEADER_FILES})