Fix gpg signing in manifest builder

[Mark-Simulacrum]

GPG versions 2.x+ require that --batch be passed if --passphrase-fd is
to be accepted.

From the man page:

   --passphrase-fd n
          Read  the passphrase from file descriptor n. Only the first line
          will be read from file descriptor n. If you use  0  for  n,  the
          passphrase  will  be  read  from STDIN. This can only be used if
          only one passphrase is supplied.

          Note that this passphrase is only used if the option --batch has
          also been given.  This is different from GnuPG version 1.x.

[rust-highfive]

r? @alexcrichton

(rust_highfive has picked a reviewer for you, use r? to override)

[alexcrichton]

@bors: r+ p=1

[bors]

📌 Commit 4d5413b has been approved by alexcrichton

[bors]

🌲 The tree is currently closed for pull requests below priority 10, this pull request will be tested once the tree is reopened

[bors]

⌛ Testing commit 4d5413b with merge 4f081f680e94f190120896119139f5eba48b5d7a...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job dist-mips-linux of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

Building stage2 tool cargo (mips-unknown-linux-gnu)
[01:08:04]  Downloading crates ...
[01:08:24] warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:08:44] warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:09:04] error: failed to download from `https://crates.io/api/v1/crates/openssl-src/111.1.0+1.1.1a/download`
[01:09:04] Caused by:
[01:09:04]   [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:09:04] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "--target" "mips-unknown-linux-gnu" "-j" "4" "--release" "--locked" "--color" "always" "--manifest-path" "/checkout/src/tools/cargo/Cargo.toml" "--features" "rustc-workspace-hack/all-static" "--message-format" "json"
[01:09:04] expected success, got: exit code: 101
---
travis_time:end:1367dfaf:start=1544596889835594349,finish=1544596889840642889,duration=5048540
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:036f2078
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb --batch -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:245758e0
travis_time:start:245758e0
$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:02ac2351
$ dmesg | grep -i kill

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[kennytm]

@bors retry travis-ci/travis-ci#9696

[bors]

⌛ Testing commit 4d5413b with merge dd8fc7d...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing dd8fc7d to master...