Silence clang 10 conversion warning
src/opusfile.c:3242:18: warning: implicit conversion from 'unsigned
int' to 'float' changes value from 4294967295 to 4294967296
[-Wimplicit-int-float-conversion]
r=seed*OP_PRNG_GAIN;
^~~~~~~~~~~~
src/opusfile.c:3179:29: note: expanded from macro 'OP_PRNG_GAIN'
# define OP_PRNG_GAIN (1.0F/0xFFFFFFFF)
~^~~~~~~~~~