Import sqlite 3.34.1 (3340100).

(cherry picked from commit 25cdacf79b06356c929e59d5074d26c9dac41bdf)

Git Hash: dad031410fa7144120627416491ace77a424879f
Git Author: cy@FreeBSD.org

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

MFC r333352 & r342183:

r333352: Update private sqlite from sqlite3-3.20.0 to sqlite3-3.23.1
r342183: Update sqlite3-3.23.1 --> sqlite3-3.26.0 (3260000)

PR: 234113
Security: https://blade.tencent.com/magellan/index_en.html
No known CVE was apparently registered.

MFV r342175:

Update sqlite3-3.23.1 --> sqlite3-3.26.0 (3260000)

MFC after: 3 days
Security: https://blade.tencent.com/magellan/index_en.html
No known CVE was apparently registered.

Import sqlite3-3.26.0 (3260000)

Obtained from: https://www.sqlite.org/2018/sqlite-autoconf-3260000.tar.gz