[PATCH v2 4/6] ci: install Asciidoctor in 'ci/install-dependencies.sh'

["SZEDER Gábor" <szeder.dev@gmail.com>]

When our '.travis.yml' was split into several 'ci/*' scripts [1], the
installation of the 'asciidoctor' gem somehow ended up in
'ci/test-documentation.sh'.

Install it in 'ci/install-dependencies.sh', where we install
everything else.

[1] 657343a602 (travis-ci: move Travis CI code into dedicated scripts,
    2017-09-10)

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 ci/install-dependencies.sh | 3 +++
 ci/test-documentation.sh   | 3 ---
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/ci/install-dependencies.sh b/ci/install-dependencies.sh
index d64667fcbf..76ec308965 100755
--- a/ci/install-dependencies.sh
+++ b/ci/install-dependencies.sh
@@ -54,6 +54,9 @@ StaticAnalysis)
 Documentation)
 	sudo apt-get -q update
 	sudo apt-get -q -y install asciidoc xmlto
+
+	test -n "$ALREADY_HAVE_ASCIIDOCTOR" ||
+	gem install asciidoctor
 	;;
 esac
 
diff --git a/ci/test-documentation.sh b/ci/test-documentation.sh
index be3b7d376a..8f91f48c81 100755
--- a/ci/test-documentation.sh
+++ b/ci/test-documentation.sh
@@ -5,9 +5,6 @@
 
 . ${0%/*}/lib.sh
 
-test -n "$ALREADY_HAVE_ASCIIDOCTOR" ||
-gem install asciidoctor
-
 make check-builtins
 make check-docs
 
-- 
2.21.0.539.g07239c3a71.dirty