Subzero: Fix unittest build dependencies.

Makefile.standalone

 # The following variables will likely need to be modified, depending on where
 # and how you built LLVM & Clang. They can be overridden in a command-line
 # invocation of make, like:
 #
 #   make LLVM_SRC_PATH=<path> LLVM_BIN_PATH=<path> \
 #        LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> ...
 #
 
 # LLVM_SRC_PATH is the path to the root of the checked out source code. This
 # directory should contain the configure script, the include/ and lib/
@@ skipping 147 matching lines @@
                -Wl,-rpath=$(abspath $(LIBCXX_INSTALL_PATH)/lib)
 
 # TODO(stichnot): Be more precise than "*.h" here and elsewhere.
 $(OBJS): $(OBJDIR)/%.o: src/%.cpp src/*.h src/*.def
         $(CXX) -c $(CXXFLAGS) $< -o $@
 
 $(OBJDIR)/run_unittests: $(UNITTEST_OBJS) $(UNITTEST_LIB_OBJS)
         $(CXX) $(LDFLAGS) -o $@ $^ $(LLVM_LDFLAGS) -lgtest -lgtest_main -ldl \
                -Wl,-rpath=$(abspath $(LIBCXX_INSTALL_PATH)/lib)
 
-$(UNITTEST_OBJS): $(OBJDIR)/unittest/%.o: unittest/%.cpp
+$(UNITTEST_OBJS): $(OBJDIR)/unittest/%.o: unittest/%.cpp \
+                unittest/*.h src/*.h src/*.def
         $(CXX) -c $(CXXFLAGS) \
                 -Isrc/ \
                 -I$(LLVM_SRC_PATH)/utils/unittest/googletest/include \
                 -DGTEST_HAS_RTTI=0 -DGTEST_USE_OWN_TR1_TUPLE \
                 $< -o $@
 
 $(OBJS): | $(OBJDIR)
 
 $(UNITTEST_OBJS): | $(OBJDIR)/unittest
 
@@ skipping 29 matching lines @@
         git diff -U0 `git merge-base HEAD master` | \
         PATH=$(LLVM_BIN_PATH):$(PATH) \
         $(LLVM_SRC_PATH)/../clang/tools/clang-format/clang-format-diff.py \
         -p1 -style=LLVM -i
 
 clean:
         rm -rf llvm2ice *.o $(OBJDIR)
 
 clean-all: clean
         rm -rf build/