Meson: check for proper size_t printf() format
Like autotools builds with #43357, meson builds should check for supported size_t printf() format on the platform, and store the result to fc_config.h.
We need to support also "%I64d"
Support for "%I64d" added in latest version.
Like autotools builds with #43357, meson builds should check for supported size_t printf() format on the platform, and store the result to fc_config.h.