Update test/test_directory.c not to fail on big-endian machines - #define approach- not implemented.

Su Lausrequested to merge
Su_Laus/libtiff:fix_test_directory_for_big_endian_machines into master

Update test/test_directory.c not to fail on big-endian machines. Added two missing TIFFClose() in order to avoid memory leaks.

Closes #652 (closed) and #656 (closed)

Edited by Su Laus

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