This is only causing confusion; change all callers to add '\n' explicitly
and drop the optional argument.

just like most libc implementations.

Of course we don't actually support locales yet, so these are trivial wrappers.

Otherwise, static constructors in functions are never called.  This
manifested itself in the jit generating wrong code when compiling a function,
as the register calling convention was not initialized, and the jvm tried
to load all method arguments into %rax.

note that as of now all functioanlity related to file or pthread locking
is not implemented or stubbed out.

confstr(NULL) is defined to return the size of required storage; use a
temporary string to make it not fault.

Import the whole string library, as well as the ctype functions from the musl
C library.  Must is a BSD licensed library that aims to be API and mostly ABI
compatible with glibc, so it's our easiest way to provide the ABI we need
without reinventing the wheel.  I will import more of the traditional non-syscall
C library code from it and expect libc/ to eventually mostly consist of slightly
modified musl code.

Do nothing yet (used for CLOEXEC, meaningless for us).

Various changes to fit into the OSv environment.  This also includes
a ramfs in-memory full filesystem.  Bootfs is rewritten as a simple
unpacker into ramfs, and the fs class is modified to wrap the VFS
instead of being an abstract subclass.