Change the function name to sqlite_unsupported_offset(X).  Only enable the
function if compiled with -DSQLITE_ENABLE_OFFSET_SQL_FUNC.  The makefiles add
that definition to shell builds.

FossilOrigin-Name: 7a7f826e324b1a2c332e2f1d0740fd0babffcaca6275a798572f02ad367b99ab
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 24a36e2..8e79133 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -1629,7 +1629,7 @@
 #define SQLITE_FUNC_SLOCHNG  0x2000 /* "Slow Change". Value constant during a
                                     ** single query - might change over time */
 #define SQLITE_FUNC_AFFINITY 0x4000 /* Built-in affinity() function */
-#define SQLITE_FUNC_LOCATION 0x8000 /* Built-in location() function */
+#define SQLITE_FUNC_OFFSET   0x8000 /* Built-in sqlite_offset() function */
 
 /*
 ** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are