d/rules: Explicitly set SQLite endianness on ppc64el

Timothy Pearsonrequested to merge
tpearson-raptor/thunderbird:debian/sid into debian/sid

Without this CFLAGS option Thunderbird uses an incorrect SQLite endianness when built on a little Endian ppc64 (ppc64el) system together with the internal SQlite source code. As a result, it is unable to initialize and load its databases, leading to a blank / unusable application.

Required flag was picked from https://bugzilla.mozilla.org/show_bug.cgi?id=1757271

This fixes bug #1033534. Tested on a Talos II workstation.

Edited by Carsten Schoenert

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