package/sysdig: fix C++ comment

Replace libjson by jsoncpp for C++ dependency which was wrongly added
by commit 74fc60a267341879ca71f8eaa64a80f5b5aaf78b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit f23129ee1e3ceb2cdbe751efed9faedbfae67d56)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/sysdig/Config.in

@@ -1,7 +1,7 @@
 config BR2_PACKAGE_SYSDIG
 	bool "sysdig"
 	depends on BR2_LINUX_KERNEL
-	depends on BR2_INSTALL_LIBSTDCPP # libjson
+	depends on BR2_INSTALL_LIBSTDCPP # jsoncpp
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 	depends on BR2_TOOLCHAIN_HAS_THREADS # elfutils, jq
 	depends on !BR2_STATIC_LIBS # elfutils