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mkdevc: fix dtracy-disabled builds (thanks ori)

--- a/sys/src/9/port/mkdevc

+++ b/sys/src/9/port/mkdevc

@@ -25,6 +25,8 @@

 		devuart = 1;

 	else if($1 == "vga")

 		devvga = 1;

+	else if($1 == "dtracy")

+		devdtracy = 1

 	for(i = 2; i <= NF; i++){

 		if($i == "dma" && objtype ~ "(386|alpha|amd64)")

 			i8237dma++;

@@ -195,14 +197,18 @@

 		printf "\n";

 	}

-	if(ndtracyprov){

-		printf "#include <dtracy.h>\n";

-		for(i = 0; i < ndtracyprov; i++)

-			printf "extern DTProvider %sprov;\n", dtracyprov[i]

-		printf "DTProvider *dtproviders[] = {\n"

-		for(i = 0; i < ndtracyprov; i++)

-			printf "\t&%sprov,\n", dtracyprov[i]

-		printf "\tnil,\n};\n\n"

+	if(devdtracy){

+		if(ndtracyprov){

+			printf "#include <dtracy.h>\n";

+			for(i = 0; i < ndtracyprov; i++)

+				printf "extern DTProvider %sprov;\n", dtracyprov[i]

+			printf "DTProvider *dtproviders[] = {\n"

+			for(i = 0; i < ndtracyprov; i++)

+				printf "\t&%sprov,\n", dtracyprov[i]

+			printf "\tnil,\n};\n\n"

+		}

+	}else{

+		printf "void dtracytick(Ureg*)\n{\n}\n\n";

 	}

 	printf "char* conffile = \"%s/%s\";\n", pwd, ARGV[1];