cross: Fix cross compilation meson error

The doc is not currently built in cross-compilation, but we still had
some meson code that eneded up being called and failed.

diff --git a/meson.build b/meson.build
index 3831544..22551d2 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -103,7 +103,7 @@ foreach sp : subprojects
       message('Created symlink to ' + project_name)
     endif
 
-    if build_infos.has_key('build-hotdoc', default: false)
+    if not meson.is_cross_build() and build_infos.has_key('build-hotdoc', default: false)
       if plugins.length() > 0
         plugins_doc_caches += [subproj.get_variable('plugins_doc_dep')]
       endif