[C++] Revert disabled test to investigate appveyor failure

Author: javierluraschi

cpp/src/arrow/CMakeLists.txt

@@ -302,22 +302,13 @@ arrow_add_pkg_config("arrow")
 
 add_arrow_test(allocator-test)
 
-if(WIN32)
-  add_arrow_test(array-test
-                 SOURCES
-                 array-test.cc
-                 array-binary-test.cc
-                 array-list-test.cc
-                 array-struct-test.cc)
-else()
-  add_arrow_test(array-test
-                 SOURCES
-                 array-test.cc
-                 array-binary-test.cc
-                 array-dict-test.cc
-                 array-list-test.cc
-                 array-struct-test.cc)
-endif()
+add_arrow_test(array-test
+               SOURCES
+               array-test.cc
+               array-binary-test.cc
+               array-dict-test.cc
+               array-list-test.cc
+               array-struct-test.cc)
 
 add_arrow_test(buffer-test)