package/rpi-firmware: install missing library

The vcdbg utility is linked to a few libraries, which so far were all
provided by the rpi-userland package.

But a not-so-recent bump of rpi-firmware pulled in a vcdbg that is
linked to an additional library, which is not privided by rpi-userland,
so we must install it.

Reported-by: cluelessperson on #buildroot
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/rpi-firmware/rpi-firmware.mk

@@ -31,6 +31,8 @@ ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_INSTALL_VCDBG),y)
 define RPI_FIRMWARE_INSTALL_TARGET_CMDS
 	$(INSTALL) -D -m 0700 $(@D)/$(if BR2_ARM_EABIHF,hardfp/)opt/vc/bin/vcdbg \
 		$(TARGET_DIR)/usr/sbin/vcdbg
+	$(INSTALL) -D -m 0644 $(@D)/$(if BR2_ARM_EABIHF,hardfp/)opt/vc/lib/libelftoolchain.so \
+		$(TARGET_DIR)/usr/lib/libelftoolchain.so
 endef
 endif # INSTALL_VCDBG