The size of off_t depends on whether large file support is enabled through
preprocessor flags, so we can't cache this.
(From OE-Core rev: 25bd4e9483a7d2c16a460b4f363e91b5b943bb58)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>