- Enable libitm (supported since GCC 13). - Update config.{guess,sub} scripts for ISL to detect riscv64. - Packages RISCV Vector intrinsics header (riscv_vector.h). - Update gcc13-libtool-no-rpath.patch to include riscv64 (lp64d) path. Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>