Rename loongarch64-linux-gnu-*-14 to loongarch64-linux-gnu-*
Avoid specifying CC=loongarch64-linux-gnu-gcc-14 in the configure phase, and just specify loongarch64-linux-gnu for target.
Avoid specifying CC=loongarch64-linux-gnu-gcc-14 in the configure phase, and just specify loongarch64-linux-gnu for target.