glcpp: Make test suite test for valgrind cleanliness.

As it turns out, 4 of our current tests are not valgrind clean,
(use after free errors or so), so this will be helpful for
investigating and fixing those.

src/glsl/glcpp/tests/glcpp-test

@@ -2,7 +2,9 @@
 
 total=0
 pass=0
+clean=0
 
+echo "====== Testing for correctness ======"
 for test in *.c; do
     echo -n "Testing $test..."
     ../glcpp < $test > $test.out
@@ -16,10 +18,28 @@ for test in *.c; do
     fi
 done
 
+echo ""
 echo "$pass/$total tests returned correct results"
 echo ""
 
-if [ "$pass" = "$total" ] ; then
+echo "====== Testing for valgrind cleanliness ======"
+for test in *.c; do
+    echo -n "Testing $test with valgrind..."
+    if valgrind --error-exitcode=1 --log-file=$test.valgrind-errors ../glcpp < $test >/dev/null; then
+	echo "CLEAN"
+	clean=$((clean+1))
+	rm $test.valgrind-errors
+    else
+	echo "ERRORS"
+	cat $test.valgrind-errors
+    fi
+done
+
+echo ""
+echo "$pass/$total tests returned correct results"
+echo "$clean/$total tests are valgrind-clean"
+
+if [ "$pass" = "$total" ] && [ "$clean" = "$total" ]; then
     exit 0
 else
     exit 1