Merge fixes to sqlite3_scrub_backup() from trunk.

FossilOrigin-Name: 91e811f51e611a37372875e96a4c51bbed2dfdea

diff --cc manifest
index 4703bf72e80d0644a5e16a2aad67fd380388bd08,7f897eb9543fa8dc04e6f85625fa8d75404f557c..78a7f9cda157342fe63f861da074a84d45c6f5a3
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,6 -1,6 +1,6 @@@
- C Merge\sthe\scache_spill\sVACUUM\sfix\sfrom\strunk.
- D 2016-07-26T04:54:54.660
 -C Ensure\sthat\sthe\ssqlite3_scrub_backup()\sextension\screates\sa\sbackup\sdatabase\sat\sleast\sas\slarge\sas\sindicated\sby\sthe\sdatabase\sheader,\seven\sif\sthe\slast\spage\sof\sthe\sinput\sdatabase\sis\sa\sfree-list\sleaf.
 -D 2016-07-26T10:46:21.988
 -F Makefile.in 6c20d44f72d4564f11652b26291a214c8367e5db
++C Merge\sfixes\sto\ssqlite3_scrub_backup()\sfrom\strunk.
++D 2016-07-26T15:17:14.899
 +F Makefile.in 7ac1f34182d307765c6439c899bd3dac2af587bf
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc d66d0395c38571aab3804f8db0fa20707ae4609a
  F README.md 8ecc12493ff9f820cdea6520a9016001cb2e59b7
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diff --cc manifest.uuid
index d764d9c2c83dfa8133cfc0be3ff65e17bea9ac40,1e810448d248a53d16d378766e4162a2e9bba33d..598e716c62c23d933d198a2957cdcfa586e5de2c
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- cc6bfdf814d5701591b69ba2d399d4a1f6f6cc98
 -483994a54dee3c7a3801e0e9d3c96fa9dbd8d2fd
++91e811f51e611a37372875e96a4c51bbed2dfdea