Fix missing deps and race conditions in HelloNaCl Makefile
Fix missing deps and race conditions in HelloNaCl Makefile


Former-commit-id: fc589416de2a53530f69e8895f5e20bc40b32d26
Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide