reconfigure libdispatch when asked to by the build script

Author: phausler

utils/build-script-impl

@@ -2408,7 +2408,7 @@ for host in "${ALL_HOSTS[@]}"; do
                 SWIFTC_BIN="$(build_directory_bin ${LOCAL_HOST} swift)/swiftc"
                 LLVM_BIN="$(build_directory_bin ${LOCAL_HOST} llvm)"
 
-                if [[ ! -f "${LIBDISPATCH_BUILD_DIR}"/config.status ]]; then
+                if [[ "${RECONFIGURE}" || ! -f "${LIBDISPATCH_BUILD_DIR}"/config.status ]]; then
                     # First time building; need to run autotools and configure
                     if [[ "$LIBDISPATCH_BUILD_TYPE" == "Release" ]] ; then
                         dispatch_build_variant_arg="release"