qa: introduce runners and more tests for newlib

For each test, if a script exists with the same name of the test
plus the .runner suffix, the runner is run instead of the test.

As a first example qa/lib/newlib/testsuite/atexit is run by
qa/lib/newlib/testsuite/atexit.runner.

These .runner scripts allow more complex checks of the side effects
generated by the test.

qa/lib/newlib/testsuite/atexit.check

@@ -1,12 +0,0 @@
-#!/cmd/rc
-
-if ( cat /tmp/qa.previous.log | grep a0cba > /dev/null ) {
-	rm /tmp/qa.previous.log
-	echo PASS
-	exit PASS
-}
-if not {
-	echo FAIL
-	cat /tmp/qa.previous.log
-	exit FAIL
-}

qa/lib/newlib/testsuite/atexit.runner

@@ -0,0 +1,18 @@
+#!/cmd/rc
+runner=$0
+test = `{echo $runner|sed 's/.runner//'}
+test_output = /tmp/output-`{basename $test}
+
+if ( test -e $test_output) rm $test_output
+
+$test > $test_output
+if ( cat $test_output | grep a0cba > /dev/null ) {
+	rm $test_output
+	echo PASS
+	exit PASS
+}
+if not {
+	cat $test_output
+	echo FAIL
+	exit FAIL
+}

qa/lib/newlib/testsuite/build.json

@@ -24,7 +24,7 @@
 		"Post": [
 			"mkdir -p $JEHANNE/arch/$ARCH/qa/lib/newlib/testsuite",
 			"find -type f -perm /a+x -exec cp {} $JEHANNE/arch/$ARCH/qa/lib/newlib/testsuite/ \\;",
-			"cp *.check $JEHANNE/arch/$ARCH/qa/lib/newlib/testsuite/",
+			"cp *.runner $JEHANNE/arch/$ARCH/qa/lib/newlib/testsuite/",
 			"git clean -xdf ."
 		],
 		"Pre": [