nlbwmon: update to latest version

Changes since last update:

32fc092 build: remove extraneous _GNU_SOURCE defines
096aaa3 build: compile with -D_GNU_SOURCE
76487b5 transform to source-only repository

Fixes build with uClibc and eglibc toolchains.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

net/nlbwmon/Makefile

@@ -5,9 +5,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/jow-/nlbwmon.git
-PKG_SOURCE_DATE:=2017-07-28
-PKG_SOURCE_VERSION:=76487b5ec06cdeed097bd91c0216ab61861bcf07
-PKG_MIRROR_HASH:=981c70a7cb1811bbf45261e64a18c5c0fca3fb3a93ac299ce614c08c153ac7e0
+PKG_SOURCE_DATE:=2017-08-02
+PKG_SOURCE_VERSION:=32fc0925cbc30a4a8f71392e976aa94b586c4086
+PKG_MIRROR_HASH:=caedb66cf6dcbdcee0d1525923e203d003ef15f34a13a328686794666f16171f
 
 CMAKE_INSTALL:=1