binutils: inherit pkgconfig to address libdebuginfod depdency

Since libdebuginfo was default distro feature[1], cross build of binutils
has been broken due to absence of pkg-config. To find the dependency
properly, we should inherit pkgconfig bbclass.

checking for aarch64-poky-linux-pkg-config... no
checking for pkg-config... no
checking whether to use debuginfod... yes
checking for libdebuginfod >= 0.179... no
configure: error: "--with-debuginfod was given, but libdebuginfod is missing or unusable."

[1]: https://lists.openembedded.org/g/openembedded-core/message/150666



Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>