app-misc/pax-utils: update pkg-config deps

The build has switched to using pkg-config to locate libcap/libseccomp
deps, so make sure we pull that in.

The .pc file is somewhat new to libcap, so we have to force a newer
version to get it.

app-misc/pax-utils/pax-utils-1.1.ebuild

@@ -17,10 +17,12 @@ SLOT="0"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~amd64-fbsd ~sparc-fbsd ~x86-fbsd"
 IUSE="caps python seccomp"
 
-RDEPEND="caps? ( sys-libs/libcap )
+RDEPEND="caps? ( >=sys-libs/libcap-2.24 )
 	python? ( dev-python/pyelftools )
 	seccomp? ( sys-libs/libseccomp )"
 DEPEND="${RDEPEND}
+	caps? ( virtual/pkgconfig )
+	seccomp? ( virtual/pkgconfig )
 	app-arch/xz-utils"
 
 _emake() {