Make quality improvements

- Write some more unit tests
- memcpy() on ARM is now faster
- Address the Musl complex math FIXME comments
- Some libm funcs like pow() now support setting errno
- Import the latest and greatest math functions from ARM
- Use more accurate atan2f() and log1pf() implementations
- atoi() and atol() will no longer saturate or clobber errno

libc/tinymath/trunc.c

@@ -32,7 +32,6 @@
 #endif
 __static_yoink("musl_libc_notice");
 
-
 /**
  * Rounds to integer, towards zero.
  */