LoongArch: Use __builtin_{fmax,fmaxf,fmin,fminf} with GCC >= 13

GCC 13 compiles these built-ins to {fmax,fmin}.{s/d} instruction, use
them instead of the generic implementation.

Link: https://gcc.gnu.org/r13-2085


Signed-off-by: Xi Ruoyao <xry111@xry111.site>