Further polish SQLite vendoring

- Now integrated with `make tags` for Emacs IDE features
- Delete some old deprecated broken full-text search engines
- Rename .h → .inc files that don't meet our definition of header
- Make sure every #include line is normal form so tools understand

See #162

third_party/sqlite3/fts3_tokenizer1.c

@@ -23,14 +23,14 @@
 **     * The FTS3 module is being built into the core of
 **       SQLite (in which case SQLITE_ENABLE_FTS3 is defined).
 */
-#include "third_party/sqlite3/fts3Int.h"
+#include "third_party/sqlite3/fts3Int.inc"
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 
 #include "libc/assert.h"
 #include "libc/mem/mem.h"
 #include "libc/stdio/stdio.h"
 #include "libc/str/str.h"
-#include "third_party/sqlite3/fts3_tokenizer.h"
+#include "third_party/sqlite3/fts3_tokenizer.inc"
 
 typedef struct simple_tokenizer {
   sqlite3_tokenizer base;