Revert "Optimizado algoritmo CRC32"

This reverts commit 41dccb7abf8e4b70a938ccaee3452e96807a7dc9.
Revert "readahead: introducir FMODE_RANDOM en POSIX_FADV_RANDOM"

This reverts commit a04300a10d1d0ee4b3292cf0fbd90cd43e689515.
Revert "Fix toolchain warnings"

This reverts commit 244a75d377797bcd75587f558b25fe557d718ff5.
Revert "Añadido Controlador J4FS"

This reverts commit 4fe3ae38e54f5d65fe9dd3b9c8adeac5ab2abd5d.