package/bwm-ng: fix build failures with gcc-5

Bumping to the latest release, for 0.6 -> 0.6.1 to fix gcc-5 build
failures due to incorrect definitions of 'static' functions.

The project also has a new home.

Fixes:
    http://autobuild.buildroot.org/results/546/546b332cf95a48412d88add2feec2ffd4712857c/
    http://autobuild.buildroot.org/results/751/751797f3b97839f69626682ce81dca9bcb2cff22/
    ...

[Thomas: keep only the locally calculated sha256 hash, and do not
mention the commented SF.net hash, since SF.net is no longer the
official upstream location.]

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/bwm-ng/Config.in

@@ -5,4 +5,4 @@ config BR2_PACKAGE_BWM_NG
 	  network and disk-io bandwidth monitor for Linux, BSD,
 	  Solaris, Mac OS X and others.
 
-	  http://sourceforge.net/projects/bwmng/
+	  http://www.gropp.org/?id=projects&sub=bwm-ng

package/bwm-ng/bwm-ng.hash

@@ -1,2 +1,2 @@
 # Locally calculated
-sha256  c1134358e268329d438b0996399003b0f0b966034fb4b5b138761c2f3c62ffdd  bwm-ng-0.6.tar.gz
+sha256  027cf3c960cd96fc9ffacdf7713df62d0fc55eeef4a1388289f8a62ae5e50df0  bwm-ng-0.6.1.tar.gz

package/bwm-ng/bwm-ng.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-BWM_NG_VERSION = 0.6
-BWM_NG_SITE = http://downloads.sourceforge.net/project/bwmng/bwmng/$(BWM_NG_VERSION)
+BWM_NG_VERSION = 0.6.1
+BWM_NG_SITE = http://www.gropp.org/bwm-ng
 BWM_NG_CONF_OPTS = --with-procnetdev --with-diskstats
 BWM_NG_LICENSE = GPLv2
 BWM_NG_LICENSE_FILES = COPYING