Add NVPTX target into build-manifest

Author: denzp

src/tools/build-manifest/src/main.rs

@@ -78,6 +78,7 @@ static TARGETS: &'static [&'static str] = &[
     "mips64el-unknown-linux-gnuabi64",
     "mipsel-unknown-linux-gnu",
     "mipsel-unknown-linux-musl",
+    "nvptx64-nvidia-cuda",
     "powerpc-unknown-linux-gnu",
     "powerpc64-unknown-linux-gnu",
     "powerpc64le-unknown-linux-gnu",