[gegl] use $(abs_srcdir) instead of $(srcdir) so stylesheet is found

[Nils Philippsen <nphilipp src gnome org>]

commit 4564a712910f482bedcb2df1ea7f2d7a1f15cdc8
Author: Nils Philippsen <nils redhat com>
Date:   Mon Nov 26 16:23:46 2012 +0100

    use $(abs_srcdir) instead of $(srcdir) so stylesheet is found

 docs/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/Makefile.am b/docs/Makefile.am
index a422e69..548436d 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -210,7 +210,7 @@ endif
 	Makefile.am
 if HAVE_ASCIIDOC
 	@echo "HTML: $@"
-	$(ASCIIDOC) --unsafe  -o $@ -a stylesheet=$(srcdir)/gegl.css -a quirks! $<
+	$(ASCIIDOC) --unsafe  -o $@ -a stylesheet=$(abs_srcdir)/gegl.css -a quirks! $<
 else
 	@echo "*** asciidoc must be available in order to make dist"
 	@false