[gtk-doc] make: Fix installation of HTML images

[Stefan Sauer <stefkost src gnome org>]

commit b6d8bc098e25c3ae5ff15ed898acfe93aebd7f1b
Author: Michael Biebl <biebl debian org>
Date:   Tue May 8 17:21:38 2018 +0200

    make: Fix installation of HTML images
    
    This affects out-of-tree builds where the configure script is run via an
    absolute path.
    
    Fixes #674163

 gtk-doc.make |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk-doc.make b/gtk-doc.make
index f87eaab..7d9a27f 100644
--- a/gtk-doc.make
+++ b/gtk-doc.make
@@ -212,6 +212,7 @@ html-build.stamp: sgml.stamp $(DOC_MAIN_SGML_FILE) $(content_files) $(expand_con
        for file in $(HTML_IMAGES) ; do \
          test -f $(abs_srcdir)/$$file && cp $(abs_srcdir)/$$file $(abs_builddir)/html; \
          test -f $(abs_builddir)/$$file && cp $(abs_builddir)/$$file $(abs_builddir)/html; \
+         test -f $$file && cp $$file $(abs_builddir)/html; \
        done;
        $(GTK_DOC_V_XREF)gtkdoc-fixxref --module=$(DOC_MODULE) --module-dir=html --html-dir=$(HTML_DIR) 
$(FIXXREF_OPTIONS)
        $(AM_V_at)touch html-build.stamp