c/float_asm: ignore false-positive -Werror=uninitialized with gcc 11
c/float_asm: ignore false-positive -Werror=uninitialized with gcc 11

On Fedora 34, gcc 11.0.1 reports:

    float_asm.c: In function ‘invsqrt_f’:
    float_asm.c:220:9: error: ‘i’ is used uninitialized [-Werror=uninitialized]
      220 |     x = *(float *)&i;
          |         ^~~~~~~~~~~~
    float_asm.c:215:13: note: ‘i’ declared here
      215 |     int32_t i;
          |             ^
    float_asm.c: In function ‘invsqrt_d’:
    float_asm.c:233:9: error: ‘i’ is used uninitialized [-Werror=uninitialized]
      233 |     x = *(double *)&i;
          |         ^~~~~~~~~~~~~
    float_asm.c:228:13: note: ‘i’ declared here
      228 |     int64_t i;
          |             ^

Ignore this warning using #pragma directives.

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