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/func.c

@@ -15,11 +15,11 @@
 */
 #include "libc/assert.h"
 #include "libc/mem/mem.h"
-#include "third_party/sqlite3/sqliteInt.h"
+#include "third_party/sqlite3/sqliteInt.inc"
 #ifndef SQLITE_OMIT_FLOATING_POINT
 #include "libc/math.h"
 #endif
-#include "third_party/sqlite3/vdbeInt.h"
+#include "third_party/sqlite3/vdbeInt.inc"
 /* clang-format off */
 
 /*