cpp: Fix CMake config library name for GPGME
cpp: Fix CMake config library name for GPGME

* lang/cpp/src/GpgmeppConfig.cmake.in.in: The link library
is of course also dynamic.

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GnuPG-Bug-Id: T3181

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme