kbuild: cleanup drivers/scsi firmware generation, part 2

Preprocess the input files directly instead of first copying
them to a different name.

drivers/scsi/Makefile

@@ -129,36 +129,29 @@ a100u2w-objs	:= inia100.o i60uscsi.o
 cpqfc-objs	:= cpqfcTSinit.o cpqfcTScontrol.o cpqfcTSi2c.o \
 		   cpqfcTSworker.o cpqfcTStrigger.o
 
+EXTRA_TARGETS := 53c8xx_d.h 53c7xx_d.h sim710_d.h 53c700_d.h
+
 include $(TOPDIR)/Rules.make
 
+53c7,8xx.o: 53c8xx_d.h 53c8xx_u.h
+53c7xx.o:   53c7xx_d.h 53c7xx_u.h
+sim710.o:   sim710_d.h
+53c700.o:   53c700_d.h
+
 53c8xx_d.h: 53c7,8xx.scr script_asm.pl
-	ln -sf 53c7,8xx.scr fake8.c
-	$(CPP) $(CPPFLAGS) -traditional -DCHIP=810 fake8.c | grep -v '^#' | $(PERL) script_asm.pl $@ $(@:_d.h=_u.h)
-	rm fake8.c
+	$(CPP) -traditional -DCHIP=810 - < $< | grep -v '^#' | $(PERL) script_asm.pl $@ $(@:_d.h=_u.h)
 
 53c8xx_u.h: 53c8xx_d.h
 
-53c7,8xx.o: 53c8xx_u.h
-
 53c7xx_d.h: 53c7xx.scr script_asm.pl
-	ln -sf $< fake7.c
-	$(CPP) $(CPPFLAGS) -traditional -DCHIP=710 fake7.c | grep -v '^#' | $(PERL) -s script_asm.pl -ncr7x0_family $@ $(@:_d.h=_u.h)
-	rm fake7.c
+	$(CPP) -traditional -DCHIP=710 - < $< | grep -v '^#' | $(PERL) -s script_asm.pl -ncr7x0_family $@ $(@:_d.h=_u.h)
 
 53c7xx_u.h: 53c7xx_d.h
 
-53c7xx.o : 53c7xx_d.h
-
 sim710_d.h: sim710.scr script_asm.pl
-	ln -sf $< fake7.c
-	$(CPP) $(CPPFLAGS) -traditional -DCHIP=710 fake7.c | grep -v '^#' | $(PERL) -s script_asm.pl -ncr7x0_family $@ $(@:_d.h=_u.h)
-	rm fake7.c
+	$(CPP) -traditional -DCHIP=710 - < $< | grep -v '^#' | $(PERL) -s script_asm.pl -ncr7x0_family $@ $(@:_d.h=_u.h)
 
 sim710_u.h: sim710_d.h
 
-sim710.o : sim710_d.h
-
 53c700_d.h: 53c700.scr script_asm.pl
 	$(PERL) -s script_asm.pl -ncr7x0_family $@ $(@:_d.h=_u.h) < $<
-
-53c700.o: 53c700_d.h