Fails to build with Meson 0.60.0

Regressed since meson@487d45c1e5bf + meson@22c38a000673. CC @eschwartz

$ meson setup /tmp/shared-mime-info_build
[...]
$ meson compile -C /tmp/shared-mime-info_build
ninja: Entering directory `/tmp/shared-mime-info_build'
[78/82] Generating data/freedesktop.org.xml with a custom command
FAILED: data/freedesktop.org.xml
/tmp/shared-mime-info/data/freedesktop_generate.sh /tmp/shared-mime-info /tmp/shared-mime-info_build
ninja: Entering directory `/tmp/shared-mime-info_build'
[1/6] Generating po/wa/LC_MESSAGES/shared-mime-info-wa.mo with a custom command
[2/6] Generating po/vi/LC_MESSAGES/shared-mime-info-vi.mo with a custom command
[3/6] Generating po/uk/LC_MESSAGES/shared-mime-info-uk.mo with a custom command
[4/6] Generating po/zh_CN/LC_MESSAGES/shared-mime-info-zh_CN.mo with a custom command
[5/6] Generating po/zh_HK/LC_MESSAGES/shared-mime-info-zh_HK.mo with a custom command
[6/6] Generating po/zh_TW/LC_MESSAGES/shared-mime-info-zh_TW.mo with a custom command
Error: cannot open mo file /tmp/shared-mime-info_build/po/*.gmo
[80/82] Compiling C object src/update-mime-database.p/update-mime-database.c.o
ninja: build stopped: subcommand failed.