MFH: r463363

Add several security fixes addressing:

• CVE-2017-6892
• CVE-2017-8361
• CVE-2017-8362
• CVE-2017-8363
• CVE-2017-8365
• CVE-2017-12562
• CVE-2017-14634

Note:

• Fix for CVE-2017-8365 is included in files/patch-CVE-2017-8361

While here:

• Fix LICENSE and add LICENSE_FILE

PR: 226271
Submitted by: jhale
Reviewed by: koobs, eadler, jbeich
Approved by: ports-secteam (eadler)
Obtained from: upstream (https://github.com/erikd/libsndfile)
Security: 004debf9-1d16-11e8-b6aa-4ccc6adda413
Security: 2b386075-1d9c-11e8-b6aa-4ccc6adda413
Differential Revision: https://reviews.freebsd.org/D14552

Approved by: ports-secteam (riggs)