enigmail: security fix

enigmail was updated to version 1.7.2 (bnc#893330)
* bugfix release which contains several bugfixes including
mail with only Bcc recipients sent in plain text (CVE-2014-5369)

Fixed bugs
bnc#893330
VUL-0: CVE-2014-5369: enigmail: mail with only Bcc recipients sent in plain text
Selected Binaries
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