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build: Prefer gpgrt-config when available.

Description

build: Prefer gpgrt-config when available.

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

This may offer better migration.

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