Have makedepend output to stdout and redirect it

This gives us better control of what files are produced.

Reviewed-by: Andy Polyakov <appro@openssl.org>

Configurations/unix-Makefile.tmpl

@@ -858,9 +858,8 @@ EOF
       if (!$disabled{makedepend} && $makedepprog =~ /\/makedepend/) {
           $recipe .= <<"EOF";
 $obj$depext: $deps
-	rm -f \$\@.tmp; touch \$\@.tmp
-	-\$(MAKEDEPEND) -f\$\@.tmp -o"|$obj$objext" -- \$(CFLAGS) $ecflags$incs -- $srcs \\
-	    2>/dev/null
+	-\$(MAKEDEPEND) -f- -o"|$obj$objext" -- \$(CFLAGS) $ecflags$incs -- $srcs \\
+	    >\$\@.tmp 2>/dev/null
 	-\$(PERL) -i -pe 's/^.*\\|//; s/ \\/(\\\\.|[^ ])*//; \$\$_ = undef if (/: *\$\$/ || /^(#.*| *)\$\$/); \$\$_.="\\n" unless !defined(\$\$_) or /\\R\$\$/g;' \$\@.tmp
 	\@if cmp \$\@.tmp \$\@ > /dev/null 2> /dev/null; then \\
 		rm -f \$\@.tmp; \\