kernel: Various changes

+ elf: Prevent dynamically linked programs from running on Soaplin.
+ sched: Support creating a process from a program_t structure.
+ syscall: Fix a bug where using syscall number 1024 would crash the OS.
+ syscall: Added a write syscall. It can only be used for writing to the standard output (FD: 1)

testing/test.asm

@@ -1,9 +1,18 @@
 bits 64
+
 section .text
     global _start
 
 _start:
-    mov rax, 1025
+    mov rax, 1      ; write syscall number
+    mov rdi, 1      ; stdout file descriptor
+    mov rsi, msg    ; pointer to message
+    mov rdx, msg_len ; message length
     syscall
+
 .loop:
-    jmp .loop
+    jmp .loop
+
+section .data
+    msg db "Hello, World. Technically, this should work on both Soaplin & Linux.", 10    ; 10 is newline
+    msg_len equ $ - msg