Use Perl to run tests suites with make

- works on Windows too!
- we need Perl to generate/build the test suites anyway
- easier & more flexible (eg, now count total number of tests run)
diff --git a/tests/Makefile b/tests/Makefile
index a741730..d1f9829 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -431,24 +431,7 @@
 	del /Q /F *.c *.exe
 endif
 
-ifndef WINDOWS
 check: $(APPS)
-	echo "Running checks (Success if all tests PASSED)"
-	RETURN=0;																\
-	for i in $(APPS);														\
-	do																		\
-		echo " - $${i}";													\
-		RESULT=`LD_LIBRARY_PATH=../library ./$${i} | grep -v 'PASS$$' | grep -v -- '----' | grep -v '^$$'`;	\
-		PASSED=`echo $$RESULT |grep PASSED`; 								\
-		echo "   $$RESULT";													\
-		if [ "x$$PASSED" = "x" ];											\
-		then																\
-			echo "**** Failed ***************";								\
-			RETURN=1;														\
-		fi; 																\
-		echo "";															\
-	done;																	\
-	if [ "$$RETURN" -eq 1 ]; then exit 1; fi
+	perl scripts/run-test-suites.pl
 
 test: check
-endif
diff --git a/tests/scripts/run-test-suites.pl b/tests/scripts/run-test-suites.pl
new file mode 100644
index 0000000..e8611f4
--- /dev/null
+++ b/tests/scripts/run-test-suites.pl
@@ -0,0 +1,35 @@
+#!/usr/bin/perl
+
+use warnings;
+use strict;
+
+use utf8;
+use open qw(:std utf8);
+
+my @suites = grep { ! /\.c$/ } glob 'test_suite_*';
+die "$0: no test suite found\n" unless @suites;
+
+# in case test suites are linked dynamically
+$ENV{'LD_LIBRARY_PATH'} = '../library';
+
+my $prefix = $^O eq "MSWin32" ? '' : './';
+
+my ($failed_suites, $total_tests_run);
+for my $suite (@suites)
+{
+    print "$suite ", "." x ( 72 - length($suite) - 2 - 4 ), " ";
+    my $result = `$prefix$suite`;
+    if( $result =~ /PASSED/ ) {
+        print "PASS\n";
+    } else {
+        $failed_suites++;
+        print "FAIL\n";
+    }
+    my ($tests, $skipped) = $result =~ /([0-9]*) tests.*?([0-9]*) skipped/;
+    $total_tests_run += $tests - $skipped;
+}
+
+print "-" x 72, "\n";
+print $failed_suites ? "FAILED" : "PASSED";
+printf " (%d suites, %d tests run)\n", scalar @suites, $total_tests_run;
+exit( $failed_suites ? 1 : 0 );