See the WHATSNEW file for details. WASI libc currently uses a separate
malloc, so the new mallocng is not currently used.
This includes a few new custom changes to disable code for handling
directed rounding modes. Wasm doesn't have directed rounding modes,
so disabling this code size saves code size, something the WASI libc
project cares about!
See the WHATSNEW file for details. The biggest change in musl is the
switch to 64-bit time_t for 32-bit targets, however WASI libc was already
using 64-bit time_t. The main change affecting WASI is an update to
Unicode 12.1.0.
Add at least a one-line comment on every
`#ifdef __wasilibc_unmodified_upstream` briefly indicating what its
purpose is.
While here, reenable some of the code that was previously disabled when
getenv wasn't supported, as getenv is now supported.
