Add the sqlite3_snapshot_cmp() interface (available only with

SQLITE_ENABLE_SNAPSHOT).

FossilOrigin-Name: 7e7289655185e7643ead6d685922528bc4d9e0ae

diff --cc manifest
index e35b915d1855983474d0f99e19eb659ea5745022,b6732de4b4ed49272da4dd0cce3b8984625cd2b6..7dc90def4336d80f66ad6e8705e9217089f1cb4d
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,8 -1,8 +1,8 @@@
- C Update\sthe\sheader\scomment\son\sthe\smemjournal.c\sfile.\s\sNo\scode\schanges.
- D 2016-04-12T11:58:18.868
 -C Update\sthe\sdocumentation\sfor\ssqlite3_snapshot_cmp()\sto\smake\sthe\scircumstances\sunder\swhich\sthe\scomparison\sis\svalid\sclearer.\sAdd\stests\sfor\sthe\ssame.
 -D 2016-04-12T15:14:25.762
++C Add\sthe\ssqlite3_snapshot_cmp()\sinterface\s(available\sonly\swith\nSQLITE_ENABLE_SNAPSHOT).
++D 2016-04-12T16:04:07.576
  F Makefile.in eba680121821b8a60940a81454316f47a341487a
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 -F Makefile.msc 1f123a0757f6f04f0341accb46457e116817159a
 +F Makefile.msc 71b8b16cf9393f68e2e2035486ca104872558836
  F README.md 8ecc12493ff9f820cdea6520a9016001cb2e59b7
  F VERSION 5d234da9b5dae329fab75ff75884cfe0a9cb3fda
  F aclocal.m4 a5c22d164aff7ed549d53a90fa56d56955281f50
@@@ -375,9 -375,9 +375,9 @@@ F src/printf.c 63e6fb12bbe702dd664dc370
  F src/random.c ba2679f80ec82c4190062d756f22d0c358180696
  F src/resolve.c b8f7174e5f8c33c44ded3a25a973d0bb89228c20
  F src/rowset.c 9fe4b3ad7cc00944386bb600233d8f523de07a6e
 -F src/select.c d9b8628acb98f1a38921888d823a6b70c7a7774b
 +F src/select.c a07e6022e2b559f3c2ec80442472c5965fa7a3fc
  F src/shell.c b7922fa264f8c8d72a5ec6dd0b091e15a93c4de5
- F src/sqlite.h.in c8f41612dc1a9b5212a891e1b65a5f589b8b884a
+ F src/sqlite.h.in 64eb70a3b309751bebf73a5552a51244f68f0ea5
  F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
  F src/sqlite3ext.h 98f72cbfe00169c39089115427d06ea05fe4b4a2
  F src/sqliteInt.h b3744b29555b83054f315f62d61b3a6558fa9e1c
@@@ -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 e2c4995bf1099cc02bcb1dc4a4631f06a870d171
- R 2e4cf3acc4cd7fa1ae0c658360dca721
 -P c698a21af740ca1019c3a771fb83e569cd6bf23e
 -R 1df0b51d3ec92c57900ed6ffc629e927
 -U dan
 -Z 0bd02cd207722d1ba1dc6f0818f7fd4a
++P 07f10deabb0f4207408142541e3913d638dfcdeb 8fc834741bf6c8a832a180795c3d6f5c3dcfcd62
++R 5656733bddcb2f7451211326ac2ed136
++T +closed 8fc834741bf6c8a832a180795c3d6f5c3dcfcd62
 +U drh
- Z ca7267cbdba15c8e817fe9239b1f31a1
++Z b8985dfa1dcfaa5a463be54da15766b9

diff --cc manifest.uuid
index 460eaacc67b195d55039c7bb1257456e28e14d42,d0089f564767fdde565e2395716fe42f3c3fa470..75b5b1aa0b15afd2ef27026e1906e84ee047ae01
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 07f10deabb0f4207408142541e3913d638dfcdeb
 -8fc834741bf6c8a832a180795c3d6f5c3dcfcd62
++7e7289655185e7643ead6d685922528bc4d9e0ae