fix windows compilation, better cmake output

gcontini

2019-12-14 79f2b46f721b69bc182f35324f8fc195a5cf3f54

 src/library/os/CMakeLists.txt

@@ -6,10 +6,11 @@
          ${CMAKE_CURRENT_SOURCE_DIR}/network_id.c)
   ELSE(UNIX)
         target_sources(licensecc_static PRIVATE 
          ${CMAKE_CURRENT_SOURCE_DIR}/openssl/signature_verifier.cpp
            ${CMAKE_CURRENT_SOURCE_DIR}/os-win.c)
   ENDIF(UNIX)
ELSE(UNIX OR OPENSSL_FOUND)
    target_sources(licensecc_static STATIC
    target_sources(licensecc_static PRIVATE
        ${CMAKE_CURRENT_SOURCE_DIR}/windows/signature_verifier.cpp
        ${CMAKE_CURRENT_SOURCE_DIR}/os-win.c)
ENDIF(UNIX OR OPENSSL_FOUND)