Drop local copy of libconfig recipe

libconfig is delivered by meta-oe - no need
to duplicate it into meta-swupdate.

Signed-off-by: Stefano Babic <sbabic@denx.de>

recipes-extended/libconfig/libconfig_1.4.9.bb

@@ -1,14 +0,0 @@
-SUMMARY = "C/C++ Configuration File Library"
-DESCRIPTION = "Library for manipulating structured configuration files"
-HOMEPAGE = "http://www.hyperrealm.com/libconfig/"
-SECTION = "libs"
-
-LICENSE = "LGPLv2.1"
-LIC_FILES_CHKSUM = "file://COPYING.LIB;md5=fad9b3332be894bab9bc501572864b29"
-
-SRC_URI = "http://www.hyperrealm.com/${BPN}/${BP}.tar.gz"
-
-inherit autotools-brokensep pkgconfig
-
-SRC_URI[md5sum] = "b6ee0ce2b3ef844bad7cac2803a90634"
-SRC_URI[sha256sum] = "09c8979252e60193e2969e9b0e1cd597f7820087867989b2f0939ad164473041"