meson: fix SIZEOF_OFF_T when cross-compiling with Meson >= 1.3.0
With only stddef.h, off_t is not defined, so when cross-compiling SIZEOF_OFF_T is -1.
We now use sys/types.h which should define off_t.
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With only stddef.h, off_t is not defined, so when cross-compiling SIZEOF_OFF_T is -1.
We now use sys/types.h which should define off_t.