Changes to sqlite3SelectNew() to work around a false-positive warning

from GCC-10.  The code is very slightly larger and slower as a result.

FossilOrigin-Name: 04e1edd8e5821a377407263829ed0d87968c708c9aeb1282107ea6f39a11c1cc

diff --cc manifest
index 23ea3b8f46e71859e9a32b00830910a73bc3b8f7,52af8c9c077051007ba3ffbb79d6b55d657df8c6..aa56b2d7e278b52de192d8e21d5c9f70f596c950
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Innocuous\schanges\sto\shelp\sCoverity\savoid\sfalse-positives.
- D 2020-05-26T10:54:46.900
 -C Attempt\sto\swork\saround\sa\sfalse-positive\swarning\sin\sthe\sCGo\scompiler.
 -D 2020-05-25T01:31:09.337
++C Changes\sto\ssqlite3SelectNew()\sto\swork\saround\sa\sfalse-positive\swarning\nfrom\sGCC-10.\s\sThe\scode\sis\svery\sslightly\slarger\sand\sslower\sas\sa\sresult.
++D 2020-05-26T11:10:25.934
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1866,7 -1866,10 +1866,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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 -T *branch * cgo-warning-workaround
 -T *sym-cgo-warning-workaround *
 -T -sym-trunk *
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++R 4b76e75897c43803d6dbedd7b8f1a56e
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  U drh
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++Z d313ebf5bd4e6feaaa94a16cfe06a420

diff --cc manifest.uuid
index 715e3b3e2bac66238cadec62404039463e293039,e9a6b2741421eb62f8f2f3d0eb6f36fdce842b03..51b60ae1bb2995f3cd0679217a27fbbb2a046213
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 4ec8a5a203f10d228d0b3389120638766cc343179dbe38d5dbf69b650765934c
 -d4bf60f464789935dc193ea99bf730c8fade448c7dca13eb3ce297965980f36e
++04e1edd8e5821a377407263829ed0d87968c708c9aeb1282107ea6f39a11c1cc