file-systems: Add NTFS support.
* gnu/system/uuid.scm (%ntfs-endianness): New macro,
(ntfs-uuid->string): new procedure,
(%ntfs-endianness): new variable,
(string->ntfs-uuid): new exported procedure,
(%uuid-parsers): add NTFS support,
(%uuid-printers): add NTFS support.
* gnu/build/file-systems.scm (%ntfs-endianness): New macro,
(ntfs-superblock?, read-ntfs-superblock, ntfs-superblock-uuid,
check-ntfs-file-system): new procedure,
(%partition-uuid-readers): add NTFS support,
(check-file-system): add NTFS support.
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