added missing csv files (ticket https://trac.osgeo.org/grass/ticket/1207)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@44847 15284696-431f-4ddb-bdfa-cd5b030d7da7

Makefile

@@ -49,7 +49,7 @@ DIRS = \
 
 SUBDIRS = $(DIRS)
 
-FILES = AUTHORS COPYING CHANGES REQUIREMENTS.html GPL.TXT contributors.csv translators.csv
+FILES = AUTHORS COPYING CHANGES REQUIREMENTS.html GPL.TXT contributors.csv contributors_extra.csv translators.csv
 FILES_DST = $(patsubst %,$(ARCH_DISTDIR)/%,$(FILES))
 
 default: