Add the sqlite3_system_errno() interface.

FossilOrigin-Name: 4bd12b57ea177cfb1f44d54bfa7aedfb8a8c0c64

diff --cc manifest
index b4be055c2830dd7c088720b6c8bf8e41c77e8013,97d82ae77a85e90aaf6991ea8239c5d7fdb87ca6..6c35067176c776595b0fb51866af82c8ba2537a7
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Change\sthe\sway\sfts5\sinternally\sallocates\ssegment\sids\sin\sorder\sto\seliminated\snon-determinism\sfrom\sthe\smodule.
- D 2016-03-21T09:56:19.361
 -C Make\ssure\ssystem\serrors\sthat\soccur\sdurign\ssqlite3_step()\sare\scaptured\sfor\nuse\sby\ssqlite3_system_errno().
 -D 2016-03-21T12:28:02.060
++C Add\sthe\ssqlite3_system_errno()\sinterface.
++D 2016-03-21T14:46:37.265
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  F Makefile.msc df0bf9ff7f8b3f4dd9fb4cc43f92fe58f6ec5c66
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diff --cc manifest.uuid
index 775d397701531a4bcb0686e479808235cede6387,c8872252d5ca2604c8b31cef7d46b6285daca16a..f6b0ceae980fe3f17a2dcb5fdceac5b3c113d7c6
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
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