qt,tests: Fix build in source directory, part 2

* lang/qt/tests/Makefile.am (AM_CPPFLAGS): Include Qt binding sources
before C++ binding sources and C sources.
--

This fixes the problem that the debug.h in the C sources was found
before the one in the Qt bindings.

Commit d23528cadf fixed it for Qt5, we
need Qt6 as well.

GnuPG-bug-id: 6673

lang/qt/tests/Makefile.am

@@ -62,10 +62,10 @@ LDADD = ../../cpp/src/libgpgmepp.la ../src/libqgpgmeqt6.la \
         ../../../src/libgpgme.la @GPGME_QT6_LIBS@ @GPG_ERROR_LIBS@ \
         @GPGME_QT6TEST_LIBS@ @LDADD_FOR_TESTS_KLUDGE@ -lstdc++
 
-AM_CPPFLAGS = -I$(top_srcdir)/lang/cpp/src -I$(top_builddir)/src \
+AM_CPPFLAGS = -I$(top_srcdir)/lang/qt/src -I$(top_srcdir)/lang/cpp/src \
+              -I$(top_builddir)/src \
               @GPG_ERROR_CFLAGS@ @GPGME_QT6_CFLAGS@ @GPG_ERROR_CFLAGS@ \
               @LIBASSUAN_CFLAGS@ @GPGME_QT6TEST_CFLAGS@ -DBUILDING_QGPGME \
-              -I$(top_srcdir)/lang/qt/src \
               -DTOP_SRCDIR="$(top_srcdir)"
 endif