fix missing part of recursive bump for png-1.6.
Ensure that pkgsrc openssl tool is used if not using builtin openssl.
Substitute the openssl tool path in a different manner, so that pkgsrc
openssl will be used if not builtin. Fixes problem with incorrect cert
hashes generated on (at least) SunOS.
fixes missing revision bump from jpeg-9.
Updated net/proftpd to 1.3.4c:
- addresses CVE-2012-6095 <http://bugs.proftpd.org/show_bug.cgi?id=3841>