package/iproute2: add optional dependencies on libselinux and libcap

The configure script will automatically detect used pkg-config if
libcap or libselinux are available.

Signed-off-by: Norbert Lange <nolange79@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 1b9f6fd03918f5ee00460efdf09422e98789bdbb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/iproute2/iproute2.mk

@@ -16,6 +16,14 @@ ifeq ($(BR2_PACKAGE_ELFUTILS),y)
 IPROUTE2_DEPENDENCIES += elfutils
 endif
 
+ifeq ($(BR2_PACKAGE_LIBCAP),y)
+IPROUTE2_DEPENDENCIES += libcap
+endif
+
+ifeq ($(BR2_PACKAGE_LIBSELINUX),y)
+IPROUTE2_DEPENDENCIES += libselinux
+endif
+
 ifeq ($(BR2_PACKAGE_IPTABLES)x$(BR2_STATIC_LIBS),yx)
 IPROUTE2_DEPENDENCIES += iptables
 else