Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues: Mozilla Thunderbird was updated to 60.7.2 / MFSA 2019-20 (boo#1138872): * CVE-2019-11707: Type confusion in Array.pop * CVE-2019-11708: sandbox escape using Prompt:Open Mozilla Thunderbird was updated to 60.7.1 / MFSA 2019-17 (boo#1137595): * CVE-2019-11703: Heap buffer overflow in icalparser.c * CVE-2019-11704: Heap buffer overflow in icalvalue.c * CVE-2019-11705: Stack buffer overflow in icalrecur.c * CVE-2019-11706: Type confusion in icalproperty.c Also fixed: No prompt for smartcard PIN when S/MIME signing is used Mozilla Thunderbird was updated to 60.7.0 / MFSA 2019-15 (boo#1135824): * Attachment pane of Write window no longer focussed when attaching files using a keyboard shortcut * CVE-2019-9815: Disable hyperthreading on content JavaScript threads on macOS * CVE-2019-9816: Type confusion with object groups and UnboxedObjects * CVE-2019-9817: Stealing of cross-domain images using canvas * CVE-2019-9818 (Windows only): Use-after-free in crash generation server * CVE-2019-9819: Compartment mismatch with fetch API * CVE-2019-9820: Use-after-free of ChromeEventHandler by DocShell * CVE-2019-11691: Use-after-free in XMLHttpRequest * CVE-2019-11692: Use-after-free removing listeners in the event listener manager * CVE-2019-11693: Buffer overflow in WebGL bufferdata on Linux * CVE-2019-7317: Use-after-free in png_image_free of libpng library * CVE-2019-9797: Cross-origin theft of images with createImageBitmap * CVE-2018-18511: Cross-origin theft of images with ImageBitmapRenderingContext * CVE-2019-11694: Uninitialized memory memory leakage in Windows sandbox * CVE-2019-11698: Theft of user history data through drag and drop of hyperlinks to and from bookmarks * CVE-2019-5798: Out-of-bounds read in Skia * CVE-2019-9800: Memory safety bugs fixed in Firefox 67 and Firefox ESR 60.7 - Disable building with LTO (boo#1133267).