xbps-src: only detect host build loops when not cross compiling

common/xbps-src/shutils/build_dependencies.sh

@@ -240,6 +240,7 @@ install_pkg_deps() {
                 continue
             else
                 echo "   [host] ${i}: not found."
+                if [ -z "$CROSS_BUILD" ]; then
                     if [ "${_realpkg}" = "$targetpkg" ]; then
                         msg_error "${pkg}: [host] build loop detected: ${_realpkg} <-> ${targetpkg} [depends on itself]\n"
                     elif [ "${_realpkg}" = "$pkg" ]; then
@@ -247,6 +248,7 @@ install_pkg_deps() {
                     fi
                 fi
             fi
+        fi
         host_missing_deps+=("${i}")
     done