package/systemd-bootchart: needs headers >= 3.17

It uses GRND_NONBLOCK, introduced in 3.17.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/systemd-bootchart/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_SYSTEMD_BOOTCHART
 	bool "systemd-bootchart"
 	depends on BR2_INIT_SYSTEMD
+	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 	help
 	  systemd-bootchart is a tool, usually run at system startup,
 	  that collects the CPU load, disk load, memory usage, as well
@@ -19,3 +20,7 @@ config BR2_PACKAGE_SYSTEMD_BOOTCHART
 	  these options are enabled.
 
 	  http://www.freedesktop.org/software/systemd/man/systemd-bootchart.html
+
+comment "systemd-bootchart needs a toolchain w/ headers >= 3.17"
+	depends on BR2_INIT_SYSTEMD
+	depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17