The vst1_*_x4 built-in functions in GCC 11 produce incorrect results,
as following exanple, this patch circumvents the issue by avoiding these
functions in GCC 11 and earlier versions.

float32x2x4_t val = {{
        {0.10f, 0.20f},
        {0.30f, 0.40f},
        {0.50f, 0.60f},
        {0.70f, 0.80f}
    }};
    float result[16];

    vst1_f32_x4(result, val);

get result = {0.100000 0.200000 0.500000 0.600000 0.000000 0.000000 0.000000 0.000000}
Signed-off-by: LI Qingwu <Qing-wu.Li@leica-geosystems.com.cn>