configure: add a note to install zlib-devel, if not there

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/configure b/configure
index 5fd0c50..9ac1845 100755
--- a/configure
+++ b/configure
@@ -1368,6 +1368,10 @@
   output_sym "CONFIG_GF_FADVISE"
 fi
 
+if test "$zlib" = "no" ; then
+  echo "Consider installing zlib-dev (zlib-devel), some fio features depend on it."
+fi
+
 echo "LIBS+=$LIBS" >> $config_host_mak
 echo "CFLAGS+=$CFLAGS" >> $config_host_mak
 echo "CC=$cc" >> $config_host_mak