[anjuta] Add build rule so that README is not flagged as missing

[Sebastien Granjoux <sgranjoux src gnome org>]

commit bb25b255a9199a32bd1f2d78fbef83864cb0cb57
Author: Sébastien Granjoux <seb sfo free fr>
Date:   Mon Sep 2 18:59:39 2019 +0200

    Add build rule so that README is not flagged as missing

 Makefile.am | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/Makefile.am b/Makefile.am
index 26646e350..1d5f788f3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -10,7 +10,7 @@ SUBDIRS = \
 
 dist_doc_DATA = \
        MAINTAINERS\
-       README\
+       README.md\
        COPYING\
        AUTHORS\
        ChangeLog\
@@ -20,6 +20,9 @@ dist_doc_DATA = \
        ROADMAP\
        THANKS
 
+README: README.md
+       cp $< $@
+
 ## Install it separately in datadir also because it is used in credits
 ## listing and packaging could compress the ones in docs dir.