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/vxworks.h

@@ -1,33 +0,0 @@
-/*
-** 2015-03-02
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-******************************************************************************
-**
-** This file contains code that is specific to Wind River's VxWorks
-*/
-#if defined(__RTP__) || defined(_WRS_KERNEL)
-/* This is VxWorks.  Set up things specially for that OS
- */
-#include <pthread.h> /* amalgamator: dontcache */
-#include <vxWorks.h>
-#define OS_VXWORKS                       1
-#define SQLITE_OS_OTHER                  0
-#define SQLITE_HOMEGROWN_RECURSIVE_MUTEX 1
-#define SQLITE_OMIT_LOAD_EXTENSION       1
-#define SQLITE_ENABLE_LOCKING_STYLE      0
-#define HAVE_UTIME                       1
-#else
-/* This is not VxWorks. */
-#define OS_VXWORKS    0
-#define HAVE_FCHOWN   1
-#define HAVE_READLINK 1
-#define HAVE_LSTAT    1
-#endif /* defined(_WRS_KERNEL) */
-       /* clang-format off */