Abort loadngo apple2, if the SixtyPical program couldn't compile.

eg/apple2/lores.60p

@@ -0,0 +1,20 @@
+byte ds_graphics @ $C050
+byte ds_text     @ $C051
+byte ds_full     @ $C052
+byte ds_split    @ $C053
+byte ds_page1    @ $C054
+byte ds_page2    @ $C055
+byte ds_lores    @ $C056
+byte ds_hires    @ $C057
+
+routine main
+  inputs a
+  outputs ds_lores, ds_page1, ds_split, ds_graphics
+  trashes a, z, n
+{
+    ld a, 0
+    st a, ds_lores
+    st a, ds_page1
+    st a, ds_split
+    st a, ds_graphics
+}

loadngo.sh

@@ -24,7 +24,7 @@ elif [ "X$arch" = "Xatari2600" ]; then
 elif [ "X$arch" = "Xapple2" ]; then
   src="$1"
   out=/tmp/a-out.bin
-  bin/sixtypical --traceback --origin=0x2000 --output-format=raw $src > $out
+  bin/sixtypical --traceback --origin=0x2000 --output-format=raw $src > $out || exit 1
   ls -la $out
   cp ~/scratchpad/linapple/res/Master.dsk sixtypical.dsk
   # TODO: replace HELLO with something that does like