MFC r360221-r360223

MFC r360221-r360223

r360221:
In preparation for update to sqlite3-3.31.1 (3310100),
recommit r357201: MFV r357163, which was reverted by r357522
due to segfault under PowerPc.

Update sqlite3-3.30.1 (3300100) --> sqlite3-3.31.0 (3310000)

r360222:
MFV r360158:

Update sqlite3-3.31.0 (3310000) --> sqlite3-3.31.1 (3310100)

Tested by:	Mark Millard <marklmi at yahoo.com>
		With to be committed PowerPC patch

r360223:
Fix PowerPC segfault.

The segfault fix was originally developed by our upstream, sqlite.org,
to address S/390 and Sparc segfaults, both of which are big endian.
Our PowerPC is also big endian, which this patch also fixes.

Reported by:	Mark Millard <marklmi at yahoo.com>
Tested by:	Mark Millard <marklmi at yahoo.com>
Obtained from:	https://www.sqlite.org/src/vinfo/04885763c4cd00cb?diff=1
		https://sqlite.org/forum/forumpost/672291a5b2