MFH: r432213

security/libgcrypt: update to 1.7.6

Noteworthy changes in version 1.7.6

• Bug fixes:
  • Fix AES CTR self-check detected failure in the SSSE3 based implementation.
  • Remove gratuitous select before the getrandom syscall.

PR: 216305
Exp-run by: antoine

Approved by: ports-secteam (feld)