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.inc

@@ -0,0 +1,33 @@
+/*
+** 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 */