package/nethogs: needs toolchain with C++

Fixes:

http://autobuild.buildroot.net/results/a250f6f3e93ceddad2d4c7cd1f29233fce2b327e
http://autobuild.buildroot.net/results/b68e8c601b31c70bc30cdfe913f7988f54255dbf
http://autobuild.buildroot.net/results/298090dfb9db42ba9f219d2c268bc798373142c7
http://autobuild.buildroot.net/results/b59851d542418ad0f40d86b32dc7573248233de4
http://autobuild.buildroot.net/results/18cc7058d567916c7d2bfb16b7808b71ed731948
http://autobuild.buildroot.net/results/786e68c8c397038511db4e8bea589839a7d9b056
http://autobuild.buildroot.net/results/8eddfca525f6951e6d11184e312cffccfc443ba8
http://autobuild.buildroot.net/results/bdfc7b723abdf4aea48e40e789883405061e4e1c

Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/nethogs/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_NETHOGS
 	bool "nethogs"
+	depends on BR2_INSTALL_LIBSTDCPP
 	select BR2_PACKAGE_LIBPCAP
 	select BR2_PACKAGE_NCURSES
 	help
@@ -8,3 +9,6 @@ config BR2_PACKAGE_NETHOGS
 	  do, it groups bandwidth by process.
 
           https://github.com/raboof/nethogs
+
+comment "nethogs needs a toolchain w/ C++"
+	depends on !BR2_INSTALL_LIBSTDCPP