Disable the install-time Qt-plugin + .so bundling step.

App/CMakeLists.txt installs a CMake script (FixPack.cmake) that runs
deploy/linux/adjust_pkg_linux.sh at install time. The script greps
ldd output for cerf/Qt/svg/icu/etc. shared libraries and copies them
plus a curated set of Qt plugins (platforms/imageformats/xcbgl) into
the install tree — appropriate for the manylinux wheel + AppImage
deliverables upstream ships, but obviously wrong on distro packaging
where Qt and friends come from system packages (and where /usr/plugins/
isn't writable from inside the sandbox).

verified 2026-05-14 against bornagain-23.0.

--- a/App/CMakeLists.txt
+++ b/App/CMakeLists.txt
@@ -134,7 +134,6 @@
 endif()

 # execute package-fixing script before CPack builds the final package file
-configure_file(${CMAKE_SOURCE_DIR}/cmake/configurables/FixPack.cmake.in
-    ${BUILD_VAR_DIR}/FixPack.cmake @ONLY)
-
-install(SCRIPT ${BUILD_VAR_DIR}/FixPack.cmake)
+# (skipped: the script bundles Qt plugins + system .so dependencies into the
+# install tree for the upstream redistributable, which is wrong for distro
+# packaging where Qt and friends come from system packages.)