Add the start of the "uri-filenames" feature.

FossilOrigin-Name: b8a8132e7148a7c90ca1352f20ab71d97b0bc4b0
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index ea0925e..da1d422 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2420,6 +2420,7 @@
   int bMemstat;                     /* True to enable memory status */
   int bCoreMutex;                   /* True to enable core mutexing */
   int bFullMutex;                   /* True to enable full mutexing */
+  int bOpenUri;                     /* True to interpret filenames as URIs */
   int mxStrlen;                     /* Maximum string length */
   int szLookaside;                  /* Default lookaside buffer size */
   int nLookaside;                   /* Default lookaside buffer count */
@@ -2655,6 +2656,7 @@
 int sqlite3Init(sqlite3*, char**);
 int sqlite3InitCallback(void*, int, char**, char**);
 void sqlite3Pragma(Parse*,Token*,Token*,Token*,int);
+u8 sqlite3GetBoolean(const char *z);
 void sqlite3ResetInternalSchema(sqlite3*, int);
 void sqlite3BeginParse(Parse*,int);
 void sqlite3CommitInternalChanges(sqlite3*);
@@ -2919,6 +2921,7 @@
 int sqlite3Atoi64(const char*, i64*, int, u8);
 void sqlite3Error(sqlite3*, int, const char*,...);
 void *sqlite3HexToBlob(sqlite3*, const char *z, int n);
+u8 sqlite3HexToInt(int h);
 int sqlite3TwoPartName(Parse *, Token *, Token *, Token **);
 const char *sqlite3ErrStr(int);
 int sqlite3ReadSchema(Parse *pParse);