haproxy: Fix non-ssl builds

- Add missing libatomic dependency in non-ssl variant of the build

Signed-off-by: Christian Lachner <gladiac@gmail.com>

net/haproxy/Makefile

@@ -77,7 +77,7 @@ endef
 define Package/haproxy-nossl
   TITLE+= (without SSL support)
   VARIANT:=nossl
-  DEPENDS+= +libpcre +libltdl +zlib +libpthread
+  DEPENDS+= +libpcre +libltdl +zlib +libpthread +libatomic
   TITLE+= (without SSL support)
 $(call Package/haproxy/Default)
 endef