Add the SQLITE_PTRSIZE macro. Use it to help sqlite3_status() run faster

on 32-bit systems.

FossilOrigin-Name: c742bd6047bc6d0319a5a8c31d97f6b9229507f6

src/main.c

@@ -128,6 +128,11 @@ int sqlite3_initialize(void){
   }
 #endif
 
+  /* If the following assert() fails on some obscure processor/compiler
+  ** combination, the work-around is to set the correct pointer
+  ** size at compile-time using -DSQLITE_PTRSIZE=n compile-time option */
+  assert( SQLITE_PTRSIZE==sizeof(char*) );
+
   /* If SQLite is already completely initialized, then this call
   ** to sqlite3_initialize() should be a no-op.  But the initialization
   ** must be complete.  So isInit must not be set until the very end