BUG: Fix linking BasicFilters library to itself

The last BasicFilter library was linking against itself. This caused a
CMP0022 warning in CMake 2.12.1 and a more useful developer warning
with the current development CMake about CMP0038, self linking.

Change-Id: Iab688f85f9ee7bc2d76e984af7e69ba4eebe98fa
Merge topic 'SIMPLEITK-482_FixCMakeLibraryConfigurationWarings' into next

de1b6196 BUG: Fix linking BasicFilters library to itself