gcc-8: enable build-id in gcc-cross-initial

Apply patch from Taras Kondratiuk <takondra@cisco.com> to gcc 8.x too.

Normal gcc-cross has build-id feature enabled by default, so most of
target binaries has build-id. But libc (glibc, musl) doesn't have
build-id, because it is built with gcc-cross-initial.

Build-id is a useful feature, so enable it for gcc-cross-initial too.

(From OE-Core rev: f24308c95853bec5cfc9f0794b111c6afecbe768)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-8.1.inc

@@ -115,6 +115,7 @@ EXTRA_OECONF_INITIAL = "\
     --with-system-zlib \
     --disable-lto \
     --disable-plugin \
+    --enable-linker-build-id \
     --enable-decimal-float=no \
     --without-isl \
     --disable-libssp \