Add the SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION method for enabling

sqlite3_load_extension() while leaving the load_extension() SQL function
disabled.

FossilOrigin-Name: c4f165c460c4244ed434107feac005efa3c386cf

diff --cc manifest
index 3b102ff17000a2da33cac24c7788442c58cd7547,05c486ec0573b82280fe9528bd90e579fdc89493..e8e1304008e20371961fb11929cd0a65f1ef79e0
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C When\san\serror\soccurs\swhile\stransitioning\sout\sof\sWAL\smode,\smake\ssure\sthe\nlocking\sstate\sis\snot\sleft\sat\sEXCLUSIVE.
- D 2016-04-20T19:30:47.222
 -C Test\scases\sfor\sSQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION.
 -D 2016-04-21T01:58:21.573
++C Add\sthe\sSQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION\smethod\sfor\senabling\s\nsqlite3_load_extension()\swhile\sleaving\sthe\sload_extension()\sSQL\sfunction\ndisabled.
++D 2016-04-21T02:27:56.575
  F Makefile.in eba680121821b8a60940a81454316f47a341487a
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc 71b8b16cf9393f68e2e2035486ca104872558836
@@@ -1482,7 -1482,7 +1482,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 38a4e9d92887898b779493c71e4500f777a4e2e7
- R d900f17deba1f548d837d30ffbaf8602
 -P b2ae5bfa32e608625bd177907596df3dbc2212e1
 -R 142ad50676c76bf1cd4debbac256d360
++P 3340f086510b08ce5b42a8781f1df51bf7c27701 debafa5efd37ac60e030d0963ce8e7c4f51a0f10
++R dbbe3c46925f0d8701c8262054bfff8c
++T +closed debafa5efd37ac60e030d0963ce8e7c4f51a0f10
  U drh
- Z 44c6d07231ede184477737327be6aaec
 -Z d6546b0e1c5ecba4524ffa3ce100a1b6
++Z 9611378dd74ba12ce4b14951f611f1d2

diff --cc manifest.uuid
index 14e0ef795f883ec2f62c3cb47d16aa60864a6ade,7305430aec8710c566bdc6b5662e4117976c717b..cda7b3c0ff37cf495c366a019118ac176458dec9
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 3340f086510b08ce5b42a8781f1df51bf7c27701
 -debafa5efd37ac60e030d0963ce8e7c4f51a0f10
++c4f165c460c4244ed434107feac005efa3c386cf