refactor: remove the deprecated SQLiteJDBCLoader isPureJavaMode and getPureJavaFlag

the deprecation was added in December 2019

BREAKING-CHANGE: methods are removed

Author: gotson

src/main/java/org/sqlite/SQLiteJDBCLoader.java

@@ -109,26 +109,6 @@ static void cleanup() {
         }
     }
 
-    /**
-     * @return True if the SQLite JDBC driver is set to pure Java mode; false otherwise.
-     * @deprecated Pure Java no longer supported
-     */
-    @Deprecated
-    static boolean getPureJavaFlag() {
-        return Boolean.parseBoolean(System.getProperty("sqlite.purejava", "false"));
-    }
-
-    /**
-     * Checks if the SQLite JDBC driver is set to pure Java mode.
-     *
-     * @return True if the SQLite JDBC driver is set to pure Java mode; false otherwise.
-     * @deprecated Pure Java no longer supported
-     */
-    @Deprecated
-    public static boolean isPureJavaMode() {
-        return false;
-    }
-
     /**
      * Checks if the SQLite JDBC driver is set to native mode.
      *