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)

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 );