[Perl] Fix testsuite to work without . in @INC

"." was removed from @INC in Perl 5.26 for security reasons, and has
also been removed from older versions in some distros.

Fixes https://github.com/swig/swig/issues/997 reported by lfam.

CHANGES.current

@@ -7,6 +7,12 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.0.0 (in progress)
 ===========================
 
+2017-06-13: olly
+	    [Perl] Fix testsuite to work without . in @INC - it was removed in
+	    Perl 5.26 for security reasons, and has also been removed from
+	    older versions in some distros.  Fixes
+	    https://github.com/swig/swig/issues/997 reported by lfam.
+
 2017-06-03: wsfulton
             Fix %import on a file containing a file scope %fragment forced inclusion to not
             generate the fragment contents as %import should not result in code being generated.

Examples/Makefile.in

@@ -282,7 +282,7 @@ perl5_static_cpp: $(SRCDIR_SRCS)
 # -----------------------------------------------------------------
 
 perl5_run:
-	$(RUNTOOL) $(PERL) $(PERL5_SCRIPT) $(RUNPIPE)
+	$(RUNTOOL) $(PERL) -I. $(PERL5_SCRIPT) $(RUNPIPE)
 
 # -----------------------------------------------------------------
 # Version display

Examples/test-suite/perl5/run-perl-test.pl

@@ -7,7 +7,7 @@ use strict;
 
 my $command = shift @ARGV;
 
-my $output = `$^X $command 2>&1`;
+my $output = `$^X -I. $command 2>&1`;
 
 die "SWIG Perl test failed: \n\n$output\n"
   if $?;