Fix implicit declaration of functions.
https://github.com/alranel/Crypt-GCrypt/pull/4
--- Makefile.PL.orig	2013-05-25 12:07:14.000000000 -0500
+++ Makefile.PL	2022-01-05 06:49:14.000000000 -0600
@@ -41,6 +41,7 @@
 # SHA-512)
 check_lib_or_exit(
     function => 'if (gcry_check_version("1.3.0")) return 0; else return 1;',
+    header => 'gcrypt.h',
     lib => [qw(gcrypt)],
     libpath => $gcrypt_libpath
 );