[sql] Remove SQLite 3.10.2 reference directory.

third_party/sqlite/sqlite-src-3100200/magic.txt

-# This file contains suggested magic(5) text for the unix file(1)
-# utility for recognizing SQLite3 databases.
-#
-# When SQLite is used as an application file format, it is desirable to
-# have file(1) recognize the database file as being with the specific
-# application.  You can set the application_id for a database file
-# using:
-#
-#     PRAGMA application_id = INTEGER;
-#
-# INTEGER can be any signed 32-bit integer.  That integer is written as
-# a 4-byte big-endian integer into offset 68 of the database header. 
-#
-# The Monotone application used "PRAGMA user_version=1598903374;" to set
-# its identifier long before "PRAGMA application_id" became available.
-# The user_version is very similar to application_id except that it is
-# stored at offset 68 instead of offset 60.  The application_id pragma
-# is preferred.  The rule using offset 60 for Monotone is for historical
-# compatibility only.
-#
-0    string  =SQLite\ format\ 3
->68  belong  =0x0f055112  Fossil checkout - 
->68  belong  =0x0f055113  Fossil global configuration - 
->68  belong  =0x0f055111  Fossil repository -
->68  belong  =0x42654462  Bentley Systems BeSQLite Database -
->68  belong  =0x42654c6e  Bentley Systems Localization File -
->60  belong  =0x5f4d544e  Monotone source repository -
->68  belong  =0x47504b47  OGC GeoPackage file -
->68  belong  =0x47503130  OGC GeoPackage version 1.0 file -
->68  belong  =0x45737269  Esri Spatially-Enabled Database -
->68  belong  =0x4d504258  MBTiles tileset -
->0   string  =SQLite      SQLite3 database