Some little fixes (now gcc compiles empty file without errors)

x86_64/crt0.s

@@ -13,7 +13,7 @@ _start:
 	pushq %rdi
 
 	# Prepare signals, memory allocation, stdio and such.
-	call initialize_standard_library
+	# call initialize_standard_library
 
 	# Run the global constructors.
 	call _init
@@ -23,9 +23,24 @@ _start:
 	popq %rsi
 
 	# Run main
-	call main
+	# call main
 
 	# Terminate the process with the exit code.
 	movl %eax, %edi
 	call exit
-.size _start, . - _start
+
+.global _init
+_init:
+	push %rbp
+	movq %rsp, %rbp
+
+.global _fini
+_fini:
+	push %rbp
+	movq %rsp, %rbp
+
+.global exit
+exit:
+	call _fini
+
+.size _start, . - _start	

x86_64/crti.s

@@ -1,5 +1,6 @@
 .section .init
 .global _init
+.type _init, @function
 _init:
    push %rbp
    movq %rsp, %rbp
@@ -7,6 +8,7 @@ _init:
 
 .section .fini
 .global _fini
+.type _fini, @function
 _fini:
    push %rbp
    movq %rsp, %rbp