Issue #5784 - Fixing LICENSE file

+ Eliminating header
+ Merging SPDX into 1 line

Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>

LICENSE

@@ -1,13 +1,3 @@
-This program and the accompanying materials are made available under
-the terms of the Eclipse Public License 2.0 which is available at
-https://www.eclipse.org/legal/epl-2.0
-This Source Code may also be made available under the following
-Secondary Licenses when the conditions for such availability set
-forth in the Eclipse Public License, v. 2.0 are satisfied:
-the Apache License v2.0 which is available at
-https://www.apache.org/licenses/LICENSE-2.0
-
-
 Eclipse Public License - v 2.0
 
     THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE
@@ -490,5 +480,4 @@ version(s), and exceptions or additional permissions here}."
    limitations under the License.
 
 
-SPDX-License-Identifier: EPL-2.0
-SPDX-License-Identifier: Apache-2.0
+SPDX-License-Identifier: EPL-2.0 OR Apache-2.0