Get rid of gcc, adds exit()

tests.asm

@@ -13,6 +13,7 @@ extern	isupper
 extern	tolower
 extern	toupper
 extern	itoa
+extern	exit
 ;console.asm
 extern	print
 extern	puts
@@ -177,8 +178,8 @@ section .bss
 	strBuff1	resb	32
 	strBuff2	resb	8
 section .text
-	global main
-main:
+	global _start
+_start:
 	push	rbp
 	mov	rbp, rsp
 
@@ -809,4 +810,5 @@ main:
 %ENDIF
 
 	leave
-	ret
+	mov	rdi, 0
+	call	exit