pinentry-mac: fix implicit function declaration

[chrstphrchvz]

Fixes: https://trac.macports.org/ticket/61421

Description

Tested on

Only the patch phase is tested: see if Azure CI Xcode 12 build succeeds.

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?

[macportsbot]

Notifying maintainers:
@Ionic for port pinentry-mac.

[macportsbot]

Travis Build #15155 Passed.

Lint results

--->  Verifying Portfile for pinentry-mac
Warning: missing recommended checksum type: size
--->  0 errors and 1 warnings found.

Port pinentry-mac success on xcode10.3. Log
Port pinentry-mac success on xcode9.4. Log
Port pinentry-mac success on xcode8.3. Log

[chrstphrchvz]

Proposed patch appears to fix the build for Xcode 12 according to Azure CI, so I have submitted upstream: GPGTools/pinentry-mac#8

[macportsbot]

Travis Build #15156 Passed.

Lint results

--->  Verifying Portfile for pinentry-mac
Warning: missing recommended checksum type: size
--->  0 errors and 1 warnings found.

Port pinentry-mac success on xcode10.3. Log
Port pinentry-mac success on xcode9.4. Log
Port pinentry-mac success on xcode8.3. Log
Port pinentry-mac success on xcode7.3. Log

[cjones051073]

works for me on macOS 11.0.1. Let merge this asap as its a relatively common dep.

[alexmarkley]

Can confirm this worked for me, also on macOS 11.0.1.