Added zutil.c to libz.la sources

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/branches/1.5-xserver@2623 3789f03b-4d11-0410-bbf8-ca57d06f2519

common/zlib/Makefile.am

@@ -5,4 +5,4 @@ HDRS = deflate.h infblock.h infcodes.h inffast.h inffixed.h inftrees.h \
 
 libz_la_SOURCES = $(HDRS) adler32.c compress.c crc32.c deflate.c gzio.c \
 	infblock.c infcodes.c inffast.c inflate.c inftrees.c infutil.c \
-	trees.c uncompr.c
+	trees.c uncompr.c zutil.c