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build: Prefer gpgrt-config when available.

Description

build: Prefer gpgrt-config when available.

* src/libgcrypt.m4: Overriding the decision by
--with-libgcrypt-prefix, use gpgrt-config libgcrypt when gpgrt-config
is available.

This may offer better migration.

  • GnuPG-bug-id: T5034
  • Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>