#pragma STDC FENV_ACCESS ON

i see lib/msun/src/e_sqrtl.c has `#pragma STDC FENV_ACCESS ON`, but
s_fma.c, s_fmaf.c, s_fmal.c, and s_nearbyint.c all use fesetround() or
fesetenv() too --- shouldn't they also have the pragma?

(Android currently builds all of libm with that pragma, but (a) that
seems like a big hammer and (b) afaict upstream [you] don't, so this
is potentially causing problems^W^Wallowing the compiler to cause
problems for you?)