[sql] Import reference version of SQLite 3.10.2.

third_party/sqlite/sqlite-src-3100200/src/memjournal.c

 /*
 ** 2008 October 7
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
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 int sqlite3IsMemJournal(sqlite3_file *pJfd){
   return pJfd->pMethods==&MemJournalMethods;
 }
 
 /* 
 ** Return the number of bytes required to store a MemJournal file descriptor.
 */
 int sqlite3MemJournalSize(void){
   return sizeof(MemJournal);
 }