* load TLS segment for executable - while we can skip PT_LOAD for executable,
  we still have to load TLS segment.
* set TCB address based on if elf is position independent

When a byte-oriented stream function touches a stream, that stream
should be set to byte-oriented mode if it hasn't been set yet. If
it has been set, the opertion should only succeed if the stream is
already in byte-oriented mode.

Signed-off-by: Wren Turkal <wt@penguintechs.org>

Signed-off-by: Wren Turkal <wt@penguintechs.org>

This function is used to set the orientation of a stream to either
byte-oriented or wchar-oriented.

More info on this function is here:
https://man7.org/linux/man-pages/man3/fwide.3p.html



This implementation only impmlemnts the manual switching and does
not yet guard against using a byte-oriented stream with wchar
functions and vice versa. Those step will come in additional
commits.

Signed-off-by: Wren Turkal <wt@penguintechs.org>

Oops, forgot to initiate the pointer after uses of CVec::new()

This patch implements getnetbyname and getnetent functions.

i.e. not depending on the first fd to be 4.