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Give all the intermediate files distinct file names, so that a
multi-CPU machine can speed up the icon build using `make -j' and
not have it break.

[originally from svn r7106]

--- a/icons/Makefile

+++ b/icons/Makefile

@@ -101,17 +101,17 @@

 # that on most modern Windows machines this won't matter too

 # much...)

 $(P48D4): %-48d4.png: %-ibase4.png

-	$(PIC)square.pl 48 1 $^ tmp2.png

-	convert -colors 16 -map $(PIC)win16pal.xpm tmp2.png $@

-	rm -f tmp.png tmp2.png

+	$(PIC)square.pl 48 1 $^ $@-tmp2.png

+	convert -colors 16 -map $(PIC)win16pal.xpm $@-tmp2.png $@

+	rm -f $@-tmp2.png

 $(P32D4): %-32d4.png: %-ibase.png

-	$(PIC)square.pl 32 1 $^ tmp2.png

-	convert -colors 16 -map $(PIC)win16pal.xpm tmp2.png $@

-	rm -f tmp.png tmp2.png

+	$(PIC)square.pl 32 1 $^ $@-tmp2.png

+	convert -colors 16 -map $(PIC)win16pal.xpm $@-tmp2.png $@

+	rm -f $@-tmp2.png

 $(P16D4): %-16d4.png: %-ibase.png

-	$(PIC)square.pl 16 1 $^ tmp2.png

-	convert -colors 16 -map $(PIC)win16pal.xpm tmp2.png $@

-	rm -f tmp.png tmp2.png

+	$(PIC)square.pl 16 1 $^ $@-tmp2.png

+	convert -colors 16 -map $(PIC)win16pal.xpm $@-tmp2.png $@

+	rm -f $@-tmp2.png

 # Build the actual Windows icons themselves, by feeding all those

 # PNGs to my icon builder script.