don't create a bogus uconv executable in /$cputype/bin/rune when
cross compiling

Reference: /n/atom/patch/applied2013/runetypecross
Date: Wed Jul 31 22:33:11 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/runetype/mkfile	Wed Jul 31 22:32:50 2013
+++ /sys/src/cmd/runetype/mkfile	Wed Jul 31 22:32:50 2013
@@ -3,7 +3,8 @@
 rune16bit='^[0-9A-F][0-9A-F][0-9A-F][0-9A-F];'
 <|mkrunesize
 url=http://www.unicode.org/Public/UNIDATA/
-uconv=/bin/rune/uconv
+<|sed -n ''''s/^([A-Z])/cpu\1/p''''  </$cputype/mkfile
+uconv=/$cputype/bin/rune/uconv
 CLIB=/sys/src/libc/port
 ULIB=/lib
 BIN=/$objtype/bin/rune
@@ -32,7 +33,7 @@
 TARG=$E\
 	uconv
 
-HELPER=/bin/rune/uconv
+HELPER=$uconv
 
 EXTRA=${E:%=$O.%}
 HDOT=${H:%=$DOT/%}
@@ -68,8 +69,9 @@
 $O.%:	%.$O $OFILES $LIB
 	$LD $LDFLAGS -o $target $prereq
 
-$HELPER: uconv.$O
-	$LD $LDFLAGS -o $HELPER $prereq
+$HELPER: uconv.c
+	$cpuCC $CFLAGS $prereq
+	$cpuLD $LDFLAGS -o $HELPER uconv.$cpuO
 
 $DOT/%.h:D: $HELPER %.rc $UTFFILES
 	$stem.rc unicodedata > $target