Make gtkdoc test pass on Debian unstable.

test cases/frameworks/10 gtk-doc/include/meson.build

@@ -13,4 +13,5 @@ generate_enums_docbook = find_program('generate-enums-docbook.py')
 
 docbook = custom_target('enum-docbook',
   output : 'bar.xml',
-  command : [generate_enums_docbook, '@OUTPUT@', 'BAR', 'BAR_TYPE', 'BAR_FOO'])
+  command : [generate_enums_docbook, '@OUTPUT@', 'BAR', 'BAR_TYPE', 'BAR_FOO'],
+  build_by_default : true)

test cases/frameworks/10 gtk-doc/installed_files.txt

@@ -1,13 +1,15 @@
+usr/include/foo-version.h
+usr/share/gtk-doc/html/foobar/BAR.html
 usr/share/gtk-doc/html/foobar/foobar.devhelp2
-usr/share/gtk-doc/html/foobar/foobar-foo.html
 usr/share/gtk-doc/html/foobar/foobar.html
+usr/share/gtk-doc/html/foobar/foobar-foo.html
+usr/share/gtk-doc/html/foobar/foobar-foo-version.html
 usr/share/gtk-doc/html/foobar/home.png
 usr/share/gtk-doc/html/foobar/index.html
-usr/share/gtk-doc/html/foobar/index.sgml
-usr/share/gtk-doc/html/foobar/left-insensitive.png
 usr/share/gtk-doc/html/foobar/left.png
-usr/share/gtk-doc/html/foobar/right-insensitive.png
+usr/share/gtk-doc/html/foobar/left-insensitive.png
 usr/share/gtk-doc/html/foobar/right.png
+usr/share/gtk-doc/html/foobar/right-insensitive.png
 usr/share/gtk-doc/html/foobar/style.css
-usr/share/gtk-doc/html/foobar/up-insensitive.png
 usr/share/gtk-doc/html/foobar/up.png
+usr/share/gtk-doc/html/foobar/up-insensitive.png