[MacPorts] #55559: gnupg2 @2.2.3: update to 2.2.4

[MacPorts]

#55559: gnupg2 @2.2.3: update to 2.2.4
--------------------+--------------------
 Reporter:  l2dy    |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  gnupg2
--------------------+--------------------
 Build failed on macOS 10.13.2 (only update version and checksums).

 {{{
 /usr/bin/clang -I/opt/local/include -I/opt/local/include
 -I/opt/local/include -I/opt/local/include  -Wall -Wno-pointer-sign
 -Wpointer-arith -pipe -Os -arch x86_64  -L/opt/local/lib
 -Wl,-headerpad_max_install_names -arch x86_64 -o gpg-agent gpg_agent-gpg-
 agent.o gpg_agent-command.o gpg_agent-command-ssh.o gpg_agent-call-
 pinentry.o gpg_agent-cache.o gpg_agent-trans.o gpg_agent-findkey.o
 gpg_agent-pksign.o gpg_agent-pkdecrypt.o gpg_agent-genkey.o gpg_agent-
 protect.o gpg_agent-trustlist.o gpg_agent-divert-scd.o gpg_agent-cvt-
 openpgp.o gpg_agent-call-scd.o gpg_agent-learncard.o
 ../common/libcommonpth.a -L/opt/local/lib -lgcrypt -lgpg-error -lassuan
 -L/opt/local/lib -lgpg-error -L/opt/local/lib -lnpth -L/opt/local/lib
 -lgpg-error -lintl -Wl,-framework -Wl,CoreFoundation  -liconv
 Undefined symbols for architecture x86_64:
   "_assuan_sock_set_system_hooks", referenced from:
       _main in gpg_agent-gpg-agent.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 make[2]: *** [gpg-agent] Error 1
 make[2]: *** Waiting for unfinished jobs....
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55559>
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