sys-auth/realmd: Fix cross-compiling by pointing to krb5-config location

pkg-config is usually preferable, but this simpler approach works here
because krb5-config is a shell script and the headers and libraries are
in standard paths.

It was previously relying on a wrapper we were creating. It still works
without that, but only because krb5-config also exists on the host, and
we shouldn't assume that.

Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>

sdk_container/src/third_party/coreos-overlay/sys-auth/realmd/realmd-0.17.0-r2.ebuild

@@ -54,6 +54,7 @@ src_configure() {
 		--with-distro=defaults
 		--disable-doc
 		--disable-nls
+		KRB5_CONFIG="${ESYSROOT}"/usr/bin/krb5-config
 	)
 	econf "${myconf[@]}"
 }