[ostree] apidoc: Remove unnecessary srcdir != builddir workaround

[Colin Walters <walters src gnome org>]

commit 5bab946b809aaf030770a57389d74766e8981030
Author: Colin Walters <walters verbum org>
Date:   Thu Jan 28 09:30:16 2016 -0500

    apidoc: Remove unnecessary srcdir != builddir workaround
    
    It seems to be fine with `gtk-doc-1.19-3.el7.noarch`, so let's drop
    this workaround, as it causes `make` warnings.

 apidoc/Makefile.am |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/apidoc/Makefile.am b/apidoc/Makefile.am
index 59cd809..dcb009e 100644
--- a/apidoc/Makefile.am
+++ b/apidoc/Makefile.am
@@ -111,10 +111,6 @@ expand_content_files= \
 # e.g. GTKDOC_LIBS=$(top_builddir)/gtk/$(gtktargetlib)
 GTKDOC_LIBS=
 
-# Hacks around gtk-doc brokenness for out of tree builds
-ostree-sections.txt: $(srcdir)/ostree-sections.txt
-       cp $< $@
-
 version.xml:
        echo -n $(VERSION) > "$@"