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Call MRCI entry point with

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Data:
DS:SI MRCREQUEST structure (see #00728)
CX = type of client:
0000h - application
0001h - file system
AX = operation
0001h - perform standard compression
0002h - perform standard decompression
0004h - perform update compression
0008h - perform MaxCompress
0020h - perform incremental decompression
0040h - perform MRCI 2.0 standard compression
0080h - perform MRCI 2.0 standard decompression
FFFFh - clear flags
BX = (AX = FFFFh) bitmask of flags to clear (set bits in BX are flags to clear)
Return:
AX = status
0000h - successful
0001h - invalid function
0002h - server busy, try again
0003h - destination buffer too small
0004h - incompressible data
0005h - bad compressed data format
BP = destroyed (MS-DOS 6.2)
Notes: MRCI driver may chain to a previous driver.