net/libzmq4: Update to 4.1.2, Fixes CVE-2014-9721

• Update to 4.1.2
• Update pkg-plist
• USES: pkg-config is now a global dependency
• OPTIONS: with-sytem-pgm is now with-pgm, update helpers
• OPTIONS: with-libsodium no longer takes args, update helpers
• Override pkgconfigdir via configure, deprecate USES: pathfix

• Bump PORTREVISION for dependent ports for shared library version change

While I'm here:

• Whitespace align Makefile

Based on:

PR: 200502
Reported by: Sevan Janiyan <venture37 geeklan co uk>
Submitted by: Jason Unovitch <jason.unovitch gmail com>
MFH: 2015Q2
Security: 10a6d0aa-0b1c-11e5-bb90-002590263bf5
Security: CVE-2014-9721