[php-src] Issue #8048: disk_*_space uses statvfs on macOS and it returns inaccruate results for some filesystems

Issue: https://github.com/php/php-src/issues/8048 Comment Author: risner Additionally, on FreeBSD there is a standards note: STANDARDS The statvfs() and fstatvfs() functions conform to IEEE Std 1003.1-2001 (“POSIX.1”). **As standardized, portable applications cannot depend on these functions returning any valid information at all.** This implementation attempts to provide as much useful information as is provided by the underlying file system, subject to the limitations of the specified data types.