icedtea-web: Update to 1.2.1 (bnc#) (important)

update to 1.2.1 bnc773458 - Security Updates CVE-2012-3422, RH840592: Potential read from an uninitialized memory location CVE-2012-3423, RH841345: Incorrect handling of not 0-terminated strings - NetX PR898: signed applications with big jnlp-file doesn't start webstart affect like "frozen"...