Magplot.test.in: remove contour test

test/Magplot.test.in

 #! @BASH@
 #
-echo 1..3 # Number of tests to be executed.
+echo 1..2 # Number of tests to be executed.
 #
 test -n "$CDO"      || CDO="@abs_top_builddir@/src/cdo $CDO_DEBUG"
 #
@@ -9,7 +9,9 @@ HAS_MAGICS=`${CDO} --config has-magics`
 XTESTDIR=$CDOTESTDATA/magics
 #
 DEVICE=png
-OPERATORS="shaded grfill contour"
+# contour png file differ for different compilers
+# OPERATORS="shaded grfill contour"
+OPERATORS="shaded grfill"
 #
 NTEST=1
 #