meson: Fix build with tests disabled
If tests are disabled, run_phoc_tests is never set, resulting in an error when the configuration is logged in root meson.build. So set it to some default value so that it's possible to build without tests
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If tests are disabled, run_phoc_tests is never set, resulting in an error when the configuration is logged in root meson.build. So set it to some default value so that it's possible to build without tests