Reduce the Flatpak size

Does the following output contain any file that we can exclude from the Flatpak package?

```
du -ha -d2

8,0K ./build-1/apr_rules.mk
348K ./build-1/libtool
4,0K ./build-1/make_exports.awk
4,0K ./build-1/make_var_export.awk
4,0K ./build-1/mkdir.sh
368K ./build-1
52K ./doc/cmake-4.2
52K ./doc
4,0K ./include/com_err.h
4,0K ./include/evdns.h
4,0K ./include/event.h
4,0K ./include/evhttp.h
4,0K ./include/evrpc.h
4,0K ./include/evutil.h
4,0K ./include/gssapi.h
68K ./include/kdb.h
12K ./include/krad.h
4,0K ./include/krb5.h
12K ./include/profile.h
8,0K ./include/snappy-c.h
8,0K ./include/snappy-sinksource.h
4,0K ./include/snappy-stubs-public.h
16K ./include/snappy.h
36K ./include/utf8proc.h
8,0K ./include/verto-module.h
20K ./include/verto.h
44K ./include/KDevelopPGQt
328K ./include/KF6
92K ./include/KompareDiff2
132K ./include/QtPdf
48K ./include/QtPdfQuick
44K ./include/QtPdfWidgets
420K ./include/QtWebEngineCore
196K ./include/QtWebEngineQuick
60K ./include/QtWebEngineWidgets
60K ./include/QtWebView
40K ./include/QtWebViewQuick
984K ./include/apr-1
178M ./include/boost
412K ./include/event2
80K ./include/gssapi
112K ./include/gssrpc
36K ./include/kadm5
224K ./include/kdev-php
20K ./include/kdevelop
2,3M ./include/kdevplatform
464K ./include/krb5
192K ./include/ksysguard
652K ./include/libnl3
56K ./include/minizip
112K ./include/pci
60K ./include/re2
16K ./include/sensors
1,9M ./include/subversion-1
187M ./include
1,5M ./lib/libapr-1.a
4,0K ./lib/libapr-1.la
948K ./lib/libaprutil-1.a
4,0K ./lib/libaprutil-1.la
776K ./lib/libnl-3.a
4,0K ./lib/libnl-3.la
192K ./lib/libnl-cli-3.a
4,0K ./lib/libnl-cli-3.la
136K ./lib/libnl-genl-3.a
4,0K ./lib/libnl-genl-3.la
144K ./lib/libnl-idiag-3.a
4,0K ./lib/libnl-idiag-3.la
528K ./lib/libnl-nf-3.a
4,0K ./lib/libnl-nf-3.la
4,7M ./lib/libnl-route-3.a
4,0K ./lib/libnl-route-3.la
416K ./lib/libnl-xfrm-3.a
4,0K ./lib/libnl-xfrm-3.la
2,0M ./lib/libpcap.a
4,0K ./lib/libsvn_auth_gnome_keyring-1.la
4,8M ./lib/libsvn_client-1.a
4,0K ./lib/libsvn_client-1.la
864K ./lib/libsvn_delta-1.a
4,0K ./lib/libsvn_delta-1.la
632K ./lib/libsvn_diff-1.a
4,0K ./lib/libsvn_diff-1.la
296K ./lib/libsvn_fs-1.a
4,0K ./lib/libsvn_fs-1.la
2,5M ./lib/libsvn_fs_fs-1.a
4,0K ./lib/libsvn_fs_fs-1.la
48K ./lib/libsvn_fs_util-1.a
4,0K ./lib/libsvn_fs_util-1.la
4,0K ./lib/libsvn_fs_util-1.so
2,5M ./lib/libsvn_fs_x-1.a
4,0K ./lib/libsvn_fs_x-1.la
332K ./lib/libsvn_ra-1.a
4,0K ./lib/libsvn_ra-1.la
200K ./lib/libsvn_ra_local-1.a
4,0K ./lib/libsvn_ra_local-1.la
1,1M ./lib/libsvn_ra_svn-1.a
4,0K ./lib/libsvn_ra_svn-1.la
1,7M ./lib/libsvn_repos-1.a
4,0K ./lib/libsvn_repos-1.la
4,0M ./lib/libsvn_subr-1.a
4,0K ./lib/libsvn_subr-1.la
4,6M ./lib/libsvn_wc-1.a
4,0K ./lib/libsvn_wc-1.la
268K ./lib/cmake
4,0K ./man/man1
12K ./man/man3
24K ./man/man5
28K ./man/man8
68K ./man
68K ./mkspecs/modules
68K ./mkspecs
6,9M ./share/doc
64K ./share/man
44K ./share/qlogging-categories6

```