nlbwmon: update to latest Git HEAD

4574e6e nfnetlink: prevent tight retry loops
163a211 client: fix commit error information
21290db nlbwmon: merge existing data
abe701d database: do not overwrite unexpectedly preexisting databases
ef3fa58 socket: handle EAGAIN on send()

Ref: https://github.com/jow-/nlbwmon/issues/23
Ref: https://github.com/jow-/nlbwmon/issues/26
Ref: https://github.com/jow-/nlbwmon/issues/30
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

net/nlbwmon/Makefile

@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=nlbwmon
-PKG_RELEASE:=2
+PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/jow-/nlbwmon.git
-PKG_SOURCE_DATE:=2017-12-05
-PKG_SOURCE_VERSION:=75accd647459a8a4167f9baa402d116cad41caa9
-PKG_MIRROR_HASH:=821572fdd11bba4a62ecea0b0ddee24645d2ceccdfe7a83dfe5f5edea433ef02
+PKG_SOURCE_DATE:=2019-06-06
+PKG_SOURCE_VERSION:=4574e6e80e3a5ab8de65886baa0d563dfee589ff
+PKG_MIRROR_HASH:=559a8b04e8942c83e31a6a5e2576a5308fdc16349ed29e0b2d9fc182d715976d
 
 CMAKE_INSTALL:=1