elfutils: Fix build break with clang

(From OE-Core rev: 68923430069fcc049ad9c5f7830f72c1c3e7d501)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/elfutils/elfutils_0.191.bb

@@ -21,6 +21,7 @@ SRC_URI = "https://sourceware.org/elfutils/ftp/${PV}/${BP}.tar.bz2 \
            file://0001-skip-the-test-when-gcc-not-deployed.patch \
            file://ptest.patch \
            file://0001-tests-Makefile.am-compile-test_nlist-with-standard-C.patch \
+           file://0001-debuginfod-Remove-unused-variable.patch \
            "
 SRC_URI:append:libc-musl = " \
            file://0003-musl-utils.patch \