Merge #12405: travis: Full clone for git subtree check

fa44af5 travis: Full clone for git subtree check (MarcoFalke)

Pull request description:

  Lazy workaround and fix for #12388

Tree-SHA512: ef2843c07bfe00b91a6f7ee551172b54db62a7e0120c734be2fa5e8cb2cb232e34f69239cae3cb319734e321822040ee7dcff00b8f0387a01afa6b3d26cc1ca3

Author: MarcoFalke

.travis.yml

@@ -8,6 +8,8 @@ cache:
   - depends/built
   - depends/sdk-sources
   - $HOME/.ccache
+git:
+  depth: false  # full clone for git subtree check, this works around issue #12388
 env:
   global:
     - MAKEJOBS=-j3
@@ -63,7 +65,6 @@ before_script:
     - if [ "$NEED_XVFB" = 1 ]; then export DISPLAY=:99.0; /sbin/start-stop-daemon --start --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac; fi
 script:
     - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then while read LINE; do travis_retry gpg --keyserver hkp://subset.pool.sks-keyservers.net --recv-keys $LINE; done < contrib/verify-commits/trusted-keys; fi
-    - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then git fetch --unshallow; fi
     - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then contrib/verify-commits/verify-commits.sh; fi
     - export TRAVIS_COMMIT_LOG=`git log --format=fuller -1`
     - if [ -n "$USE_SHELL" ]; then export CONFIG_SHELL="$USE_SHELL"; fi