* configure.ac: Add option to enable building the Qt 6 binding with
-fPIC. Fix typo and mention default for --enable-no-direct-extern-access
option.
* m4/qt6.m4: Add -fPIC to GPGME_QT6_CFLAGS if requested or if Qt 6 was
built with reduce_relocations.
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GnuPG-bug-id: 6781