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pc64: prevent dat.h from getting overwritten by ../pc/dat.h

the rule that was used to copy header files from ../pc
accidently overwrote dat.h when ../pc/dat.h was updated
because it matched on all *.h files that was also found
in ../pc directory. change to exact match on $PCHEADERS
to prevent this.

--- a/sys/src/9/pc64/mkfile

+++ b/sys/src/9/pc64/mkfile

@@ -85,11 +85,12 @@

 # copies generated by the rule below

 PCHEADERS=wifi.h uncached.h usbehci.h screen.h etherif.h ethermii.h mp.h io.h ahci.h

-&.h:	../pc/&.h

+REPCH=`{echo $PCHEADERS | sed 's/\.h//g; s/ /|/g'}

+^($REPCH)\.h:R:	'../pc/\1.h'

 	cp $prereq .

-PCFILES=`{../port/mkfilelist ../pc}

-^($PCFILES)\.$O:R:	'../pc/\1.c'

+REPCC=`{../port/mkfilelist ../pc}

+^($REPCC)\.$O:R:	'../pc/\1.c'

 	$CC $CFLAGS -I. -. ../pc/$stem1.c

 <../boot/bootmkfile