Add a perl wrapper. mergmaster(8) is broken with out it.

Submitted by:	DES

usr.bin/perl/Makefile

@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+PROG=	perl
+NOMAN=
+
+.include <bsd.prog.mk>

usr.bin/perl/perl.c

@@ -0,0 +1,62 @@
+/*-
+ * Copyright (c) 2002 Dag-Erling Coïdan Smørgrav
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+extern char **environ;
+
+int
+main(int argc __unused, char *argv[])
+{
+	char path[PATH_MAX];
+	const char *p, *q, *self;
+	size_t len;
+
+	self = argv[0];
+	argv[0] = path;
+	for (p = q = getenv("PATH"); p && *p && *q; p = q + 1) {
+		for (q = p; *q && *q != ':'; ++q)
+			/* nothing */ ;
+		len = snprintf(path, sizeof path, "%.*s/perl", (int)(q - p), p);
+		if (len >= PATH_MAX || strcmp(path, self) == 0)
+			continue;
+		execve(path, argv, environ);
+		if (errno != ENOENT)
+			err(1, "%s", path);
+	}
+	errx(1, "Perl is not installed, try 'pkg_add -r perl'");
+}