Missing copyright and license statements in new files

[eeide]

These files, which were added at commit a55522a, are missing comment headers with copyright and license information.

clang_delta/ReplaceArrayAccessWithIndex.cpp
clang_delta/ReplaceArrayAccessWithIndex.h

@mortior, I would welcome a pull request from you to address this issue. Alternatively, if you tell me here that these files can be licensed under the same terms as the rest of C-Reduce, I will insert the appropriate notices myself.

(C-Reduce is primarily licensed under the University of Illinois Open Source License. See the file COPYING for details.)

Thanks!