testing/sentinel-minipot: fix build on riscv64
I understand now what is going on, since check() is disabled on the riscv64 package builder checkdepends is not installed, but check-dev (not check) is a needed dependency, otherwise the configure script will fail with
checking for check >= 0.11... no
configure: error: Package requirements (check >= 0.11) were not met:
Package 'check', required by 'virtual:world', not found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables CHECK_CFLAGS
and CHECK_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.