Link against ZLIB when zlib is used
Link against ZLIB when zlib is used

Signed-off-by: Paul Bakker <88ac038d8196f7eaa6ad0d16b784e53baba09fbc@polarssl.org>

NXPmicro/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls