Modify several extensions to use the new exported function naming.

Fix some shared library compilation issues.

FossilOrigin-Name: 1e39f85077f1f2b96c3a656c5b6334bafb005908

src/sqlite3ext.h

@@ -474,11 +474,14 @@ struct sqlite3_api_routines {
   ** extension */
 # define SQLITE_EXTENSION_INIT1     const sqlite3_api_routines *sqlite3_api=0;
 # define SQLITE_EXTENSION_INIT2(v)  sqlite3_api=v;
+# define SQLITE_EXTENSION_INIT3     \
+    extern const sqlite3_api_routines *sqlite3_api;
 #else
   /* This case when the file is being statically linked into the 
   ** application */
 # define SQLITE_EXTENSION_INIT1     /*no-op*/
 # define SQLITE_EXTENSION_INIT2(v)  (void)v; /* unused parameter */
+# define SQLITE_EXTENSION_INIT3     /*no-op*/
 #endif
 
 #endif /* _SQLITE3EXT_H_ */

src/test_schema.c

@@ -344,7 +344,10 @@ int Sqlitetestschema_Init(Tcl_Interp *interp){
 /*
 ** Extension load function.
 */
-int sqlite3_extension_init(
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int sqlite3_schema_init(
   sqlite3 *db, 
   char **pzErrMsg, 
   const sqlite3_api_routines *pApi