[libcxx] Add FILE_DEPENDENCIES line to the func.blocks.sh.cpp test

This should fix the bots that use ssh.py to execute tests

libcxx/test/libcxx/utilities/function.objects/func.blocks.sh.cpp

@@ -11,6 +11,7 @@
 // UNSUPPORTED: c++98, c++03
 // REQUIRES: has-fblocks
 
+// FILE_DEPENDENCIES: %t.exe
 // RUN: %{build} -fblocks
 // RUN: %{run}