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build: Require same major/minor version of gpgme as version of qgpgme

Description

build: Require same major/minor version of gpgme as version of qgpgme

* CMakeLists.txt: Set GPGME_REQUIRED_VERSION to
VERSION_MAJOR.VERSION_MINOR.0.

Often API changes in gpgme are reflected in qgpgme. Therefore, always
require the same major/minor version of gpgme for qgpgme.