Fix macro redefinition warning in FFTW test

unsupported/test/CMakeLists.txt

diff --git a/unsupported/test/CMakeLists.txt b/unsupported/test/CMakeLists.txt
index 3a985cf..8af6130 100644
--- a/unsupported/test/CMakeLists.txt
+++ b/unsupported/test/CMakeLists.txt
@@ -69,9 +69,9 @@
   ei_add_property(EIGEN_TESTED_BACKENDS "fftw, ")
   include_directories( ${FFTW_INCLUDES} )
   if(FFTWL_LIB)
-    ei_add_test(FFTW  "-DEIGEN_FFTW_DEFAULT -DEIGEN_HAS_FFTWL" "${FFTW_LIBRARIES}" )
+    ei_add_test(FFTW  "-DEIGEN_HAS_FFTWL" "${FFTW_LIBRARIES}" )
   else()
-    ei_add_test(FFTW  "-DEIGEN_FFTW_DEFAULT" "${FFTW_LIBRARIES}" )
+    ei_add_test(FFTW  "${FFTW_LIBRARIES}" )
   endif()
 else()
   ei_add_property(EIGEN_MISSING_BACKENDS "fftw, ")
@@ -82,8 +82,8 @@
   if(EIGEN_TEST_CXX11)
     ei_add_property(EIGEN_TESTED_BACKENDS "pocketfft, ")
     include_directories( ${POCKETFFT} )
-    ei_add_test(pocketfft "-pthread" "${CMAKE_THREAD_LIBS_INIT}" "-DEIGEN_POCKETFFT_DEFAULT" )  
-  endif()  
+    ei_add_test(pocketfft "-pthread" "${CMAKE_THREAD_LIBS_INIT}" )
+  endif()
 else()
   ei_add_property(EIGEN_MISSING_BACKENDS "pocketfft, ")
 endif()