[rygel] build: Replace non-portable cp -d

[Jens Georg <jensgeorg src gnome org>]

commit f0ae3f0b6fab7fc962a0feb86ed6b46249a1f047
Author: Jens Georg <mail jensge org>
Date:   Sun Feb 9 13:09:24 2014 +0100

    build: Replace non-portable cp -d
    
    Signed-off-by: Jens Georg <mail jensge org>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=722527

 doc/reference/doc-build.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/doc/reference/doc-build.am b/doc/reference/doc-build.am
index 0bae4eb..ab95f1d 100644
--- a/doc/reference/doc-build.am
+++ b/doc/reference/doc-build.am
@@ -66,7 +66,7 @@ all: valadoc-gen gtkdoc-gen
 # The chmod corrects the directory permissions so that distcheck can remove the installed files.
 install-data-hook: gtkdoc/html/index.html
        $(MKDIR_P) $(RYGEL_GTKDOC_INSTALL_DIR)
-       cp -d -R $(srcdir)/gtkdoc/html/* $(RYGEL_GTKDOC_INSTALL_DIR)
+       cp -p -R $(srcdir)/gtkdoc/html/* $(RYGEL_GTKDOC_INSTALL_DIR)
        chmod -R u+w $(RYGEL_GTKDOC_INSTALL_DIR)
 
 else