acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))
[musl] / crt / i386 /
drwxr-xr-x   ..
-rw-r--r-- 310 crt1.s
-rw-r--r-- 73 crti.s
-rw-r--r-- 41 crtn.s