[PATCH] create builtins.c properly on old cpp

[<kabe@xxxxxxxxxxxxxxxx>]

Encontered this on ancient gcc-2.95.3 environment;
src/builtins.def.in -> src/builtins.def generation emitted
^ $
lines (likely by /* */), which where NOT ignored by 
src/mkbuiltins and generating bogus builtins.c.

-- kabe

diff -U6 -p dash-0.5.8/src/mkbuiltins.dist dash-0.5.8/src/mkbuiltins
--- dash-0.5.8/src/mkbuiltins.dist	Sun Sep 28 17:19:32 2014
+++ dash-0.5.8/src/mkbuiltins	Mon Dec 22 14:36:43 2014
@@ -66,13 +66,13 @@ cat <<\!
  */
 
 #include "shell.h"
 #include "builtins.h"
 
 !
-< $builtins sed '/^#/d; /^$/d' > $temp
+< $builtins sed '/^#/d; /^ *$/d' > $temp
 awk '{	printf "int %s(int, char **);\n", $1}' $temp
 echo '
 const struct builtincmd builtincmd[] = {'
 awk '{	for (i = 2 ; i <= NF ; i++) {
 		line = $i "\t" $1
 		if ($i ~ /^-/)
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