Arch Linux

Description:
When enabling all testing repos (testing and community-testing) there are file conflicts with libmypaint and mypain
```
mypaint: /usr/include/libmypaint/mypaint-brush-settings-gen.h exists in filesystem (owned by libmypaint)
mypaint: /usr/include/libmypaint/mypaint-brush-settings.h exists in filesystem (owned by libmypaint)
mypaint: /usr/include/libmypaint/mypaint-brush.h exists in filesystem (owned by libmypaint)
mypaint: /usr/include/libmypaint/mypaint-config.h exists in filesystem (owned by libmypaint)
mypaint: /usr/include/libmypaint/mypaint-fixed-tiled-surface.h exists in filesystem (owned by libmypaint)
mypaint: /usr/include/libmypaint/mypaint-glib-compat.h exists in filesystem (owned by libmypaint)
mypaint: /usr/include/libmypaint/mypaint-rectangle.h exists in filesystem (owned by libmypaint)
mypaint: /usr/include/libmypaint/mypaint-surface.h exists in filesystem (owned by libmypaint)
mypaint: /usr/include/libmypaint/mypaint-tiled-surface.h exists in filesystem (owned by libmypaint)
mypaint: /usr/lib/pkgconfig/libmypaint.pc exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/ca/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/cs/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/da/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/de/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/en_CA/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/en_GB/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/es/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/fa/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/fi/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/fr/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/he/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/hu/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/id/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/it/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/ja/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/ko/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/nb/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/nn_NO/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/pl/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/pt_BR/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/ro/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/ru/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/sc/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/sk/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/sl/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/sv/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/tr/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/uk/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/zh_CN/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
mypaint: /usr/share/locale/zh_TW/LC_MESSAGES/libmypaint.mo exists in filesystem (owned by libmypaint)
```

Additional info:
libmypaint 1.4.0-1
mypaint 1.2.1-7 (community)

Steps to reproduce:
# enable testing
pacman -S mnypaint libmypaint