build,qt: Decouple handling of include headers
69558f2c0bed
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Description

build,qt: Decouple handling of include headers

* lang/qt/src/Makefile.am (includeprefix): Replace with...
(includeprefix5, includeprefix6): ...these.
(qgpgmeincludedir): Replace with...
(qgpgme5includedir, qgpgme6includedir): ...these.
(qgpgmeinclude_HEADERS): Replace with...
(qgpgme5include_HEADERS, qgpgme6include_HEADERS): ...these.
(nodist_qgpgmeinclude_HEADERS): Replace with...
(nodist_qgpgme5include_HEADERS, nodist_qgpgme6include_HEADERS): ..these.
(camelcaseincludedir): Replace with...
(camelcase5includedir, camelcase6includedir): ...these.
(camelcaseinclude_HEADERS): Replace with...
(camelcase5include_HEADERS, camelcase6include_HEADERS): ...these.

This prepares the code for the case that WANT_QT5 and WANT_QT6 are both
true.