Avoid requiring 'make depend' here.

Really this should not be a DPSRCS.  The acct_test.c should not #include
convert.c, but just link it in as a normal SRCS.

MFC after:	1 week
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tests/sys/kern/acct/Makefile

@@ -9,6 +9,7 @@ CFLAGS+=	-I${.OBJDIR}
 CLEANFILES+=	convert.c convert.c.tmp
 
 DPSRCS.acct_test=	convert.c
+acct_test.o: convert.c
 
 convert.c: ${SRCTOP}/sys/kern/kern_acct.c
 	sed -n -e 's/log(/syslog(/g' \