libc: Use the new write() syscall

The new one is write(fd, buf, count).
The old one was write(buf, count).

So the old one tries to pass buf as a file descriptor, and write() complains that 4000000 is too large of a file descriptor and throws EBADF.

We now use the new syscall, through the wrapper that fwrite() provides us.

libs/libc/src/luna.cpp

@@ -1,4 +1,5 @@
 #include <luna.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/syscall.h>
@@ -20,7 +21,7 @@ extern "C"
 
     noreturn void __luna_abort(const char* message)
     {
-        syscall(SYS_write, message, strlen(message));
+        fwrite(message, strlen(message), 1, stdout);
         abort();
     }
 }

libs/libc/src/stdio.cpp

@@ -10,9 +10,9 @@ extern "C"
 {
     int puts(const char* s)
     {
-        long nwritten = syscall(SYS_write, s, strlen(s));
+        long nwritten = fwrite(s, strlen(s), 1, stdout);
         if (nwritten < 0) return -1;
-        nwritten += syscall(SYS_write, "\n", 1);
+        nwritten += fwrite("\n", 1, 1, stdout);
         return (int)nwritten;
     }
     void perror(const char* s) // FIXME: Print to stderr, whenever we have an stderr.