[c86] Allow C86 to compile using most all ELKS libc header files

[ghaerr]

With the recent enhancements made to the C86 toolchain and the ELKS C86 compiler driver ecc, most all the ELKS C library header files are now acceptable input to C86, making a major step forward in moving down the path with the next step of beginning to compile the ELKS C library and bringing a toolchain to ELKS.

which header should I include to use the system calls implemented in the syscall.asm currently in 8086-toolchat repo?

You can now use the standard C headers to access system calls with the 8086 toolchain. I have currently tested the following include files which are accepted:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <termios.h>
#include <time.h>
#include <sys/ioctl.h>
#include <sys/stat.h>

[ghaerr]

Oops @rafael2k, I need to add stdarg.h which I've just written over to 8086-toolchain in order for this to work. I'll submit a PR shorty.

[rafael2k]

Yay! Will test as soon as you merge!