build: Fix make distdir

[hebasto]

Currently (a8dbc01):

$ make distdir
make  distdir-am
make[1]: Entering directory '/home/hebasto/GitHub/gui-qml'
if test -d "bitcoin-22.99.0"; then find "bitcoin-22.99.0" -type d ! -perm -200 -exec chmod u+w {} ';' && rm -rf "bitcoin-22.99.0" || { sleep 5 && rm -rf "bitcoin-22.99.0"; }; else :; fi
test -d "bitcoin-22.99.0" || mkdir "bitcoin-22.99.0"
 (cd src && make  top_distdir=../bitcoin-22.99.0 distdir=../bitcoin-22.99.0/src \
     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)
make[2]: Entering directory '/home/hebasto/GitHub/gui-qml/src'
make  distdir-am
make[3]: Entering directory '/home/hebasto/GitHub/gui-qml/src'
make[3]: *** No rule to make target 'qml/pages/*.qml)', needed by 'distdir-am'.  Stop.
make[3]: Leaving directory '/home/hebasto/GitHub/gui-qml/src'
make[2]: *** [Makefile:16725: distdir] Error 2
make[2]: Leaving directory '/home/hebasto/GitHub/gui-qml/src'
make[1]: *** [Makefile:932: distdir-am] Error 1
make[1]: Leaving directory '/home/hebasto/GitHub/gui-qml'
make: *** [Makefile:926: distdir] Error 2

[promag]

utACK eeb7598.