make temporary fix for FTBFS on arm64

debian/changelog

@@ -1,3 +1,11 @@
+lxqt-qtplugin (2.0.0-0ubuntu2) UNRELEASED; urgency=medium
+
+  * Temporary fix for FTBFS on arm64.
+    - d/patches: Add set-qt-plugin-dir-via-configure.patch.
+    - d/rules: Pass QT_PLUGINS_DIR to configure.
+
+ -- Rik Mills <rikmills@kde.org>  Wed, 28 Aug 2024 14:06:13 +0100
+
 lxqt-qtplugin (2.0.0-0ubuntu1) oracular; urgency=medium
 
   * New upstream release.

debian/patches/series

@@ -0,0 +1 @@
+set-qt-plugins-dir-via-configure.patch

debian/patches/set-qt-plugins-dir-via-configure.patch

@@ -0,0 +1,17 @@
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -51,10 +51,10 @@
+ endif()
+ 
+ # execute the command "qmake -query QT_INSTALL_PLUGINS" to get the path of plugins dir.
+-execute_process(COMMAND ${QT_QMAKE_EXECUTABLE} -query QT_INSTALL_PLUGINS
+-    OUTPUT_VARIABLE QT_PLUGINS_DIR
+-    OUTPUT_STRIP_TRAILING_WHITESPACE
+-)
++#execute_process(COMMAND ${QT_QMAKE_EXECUTABLE} -query QT_INSTALL_PLUGINS
++#    OUTPUT_VARIABLE QT_PLUGINS_DIR
++#    OUTPUT_STRIP_TRAILING_WHITESPACE
++#)
+ if(QT_PLUGINS_DIR)
+     message(STATUS "Qt6 plugin directory:" "${QT_PLUGINS_DIR}")
+ else()

debian/rules

@@ -9,4 +9,5 @@ export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 
 override_dh_auto_configure:
 	dh_auto_configure --\
-		-DCMAKE_BUILD_TYPE=RelWithDebInfo
+		-DCMAKE_BUILD_TYPE=RelWithDebInfo \
+		-DQT_PLUGINS_DIR=/usr/lib/${DEB_HOST_MULTIARCH}/qt6/plugins