Subzero: Add necessary PNaCl files for standalone build.

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> LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> \
 #        PNACL_BIN_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 725 matching lines @@
 # Provide validation of user awesomeness!
         echo Success
 
 FORMAT_BLACKLIST =
 # Add one of the following lines for each source file to ignore.
 FORMAT_BLACKLIST += ! -name IceParseInstsTest.cpp
 FORMAT_BLACKLIST += ! -name IceParseTypesTest.cpp
 FORMAT_BLACKLIST += ! -name assembler_arm.h
 FORMAT_BLACKLIST += ! -name assembler_arm.cc
 FORMAT_BLACKLIST += ! -path "./wasm-install/*"
+FORMAT_BLACKLIST += ! -path "./pnacl-llvm/*"
 format:
         $(CLANG_FORMAT_PATH)/clang-format -style=LLVM -i \
           `find . -regex '.*\.\(c\|h\|cpp\)' $(FORMAT_BLACKLIST)`
 
 format-diff:
         git diff -U0 `git merge-base HEAD master` | \
           PATH=$(PNACL_BIN_PATH):$(PATH) \
           $(LLVM_SRC_PATH)/../clang/tools/clang-format/clang-format-diff.py \
           -p1 -style=LLVM -i
 
@@ skipping 19 matching lines @@
 
 help-check-xtest:
         @cat Makefile.standalone-help/check-xtest.txt
 
 clean:
         rm -rf pnacl-sz *.o $(foreach nexe,$(NEXES),$(notdir $(nexe))) \
           $(OBJDIR) $(SB_OBJDIR) $(SBB_OBJDIR) build/*.bloat.json
 
 clean-all: clean
         rm -rf build/ crosstest/Output/