[KBUILD] md/raid6 breaks separate source/object tree

[Richard Chan]

md/raid6 is using an in-tree perl script to generate a C file.
This breaks kbuild separate src/obj tree.

 CC [M]  drivers/md/raid6main.o
 CC [M]  drivers/md/raid6algos.o
 CC [M]  drivers/md/raid6recov.o
 HOSTCC  drivers/md/mktables
drivers/md/mktables > drivers/md/raid6tables.c || ( rm -f 
drivers/md/raid6tables.c && exit 1 )
 CC [M]  drivers/md/raid6tables.o
perl drivers/md/unroll.pl 1 < 
/usr/src/linux-2.6.2-rc1.1.A/drivers/md/raid6int.uc > 
drivers/md/raid6int1.c || ( rm -f drivers/md/raid6int1.c && exit 1 )
Can't open perl script "drivers/md/unroll.pl": No such file or directory

Somehow the src in $(PERL) $(src)/drivers/md/unroll.pl is not getting 
substituted.

Still trying to figure it out...
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