build: add libavltree, libcommon & libheap dependencies

Otherwise it can break on very parallel builds since collectd link time
arrives before one or more of these were built.

Status: requested github pull (patch slightly different for newer rev).

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura collectd-5.5.0.orig/src/daemon/Makefile.am collectd-5.5.0/src/daemon/Makefile.am
--- collectd-5.5.0.orig/src/daemon/Makefile.am	2015-07-06 10:01:17.820506239 -0300
+++ collectd-5.5.0/src/daemon/Makefile.am	2015-07-06 10:02:03.364054763 -0300
@@ -49,7 +49,7 @@
 collectd_CFLAGS = $(AM_CFLAGS)
 collectd_LDFLAGS = -export-dynamic
 collectd_LDADD = libavltree.la libcommon.la libheap.la -lm
-collectd_DEPENDENCIES =
+collectd_DEPENDENCIES = libavltree.la libcommon.la libheap.la
 
 # Link to these libraries..
 if BUILD_WITH_LIBRT