Scrap preprocessor, add .include directive instead

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

examples/deadbeef.asm

@@ -1,14 +1,4 @@
-.section data $0x1000 {
-    beef: .u16 $0xBEEF
-    ; TODO(syntax)
-    ; bytes: .u8 [
-    ;     $0xEF,
-    ;     $0xBE,
-    ;     $0xAD,
-    ;     $0xDE,
-    ; ]
-    .export beef
-}
+.include "constants.asm"
 
 .section code $0x0 {
     main:
@@ -20,7 +10,7 @@
         or %r0, %r01
         cmpeq %r0, $0xDEADBEEF
         ; jump to the address 'end'
-        jz end
+        jnz end
         mov %status, $1
     end:
         halt