cmd/dist: Make windows.c's fatal() print to stderr

Generating env.bat using dist env -wp > env.bat failed silently
if case of an error, because the message was redirected to env.bat.
Verbose messages still go to stdout, causing problems, but that's
a seperate change.
Made errprintf() identical to xprintf(), except for the output handle.
Yes, it's duplicate code, but most of the function is unpacking
the argument list and preparing it for WriteFile(), which has to be
done anyway.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/6343047

src/cmd/dist/windows.c

@@ -121,6 +121,22 @@ errstr(void)
 	return bstr(&b);  // leak but we're dying anyway
 }
 
+static void
+errprintf(char *fmt, ...) {
+	va_list arg;
+	char *p;
+	DWORD n, w;
+
+	va_start(arg, fmt);
+	n = vsnprintf(NULL, 0, fmt, arg);
+	p = xmalloc(n+1);
+	vsnprintf(p, n+1, fmt, arg);
+	va_end(arg);
+	w = 0;
+	WriteFile(GetStdHandle(STD_ERROR_HANDLE), p, n, &w, 0);
+	xfree(p);
+}
+
 void
 xgetenv(Buf *b, char *name)
 {
@@ -709,7 +725,7 @@ fatal(char *msg, ...)
 	vsnprintf(buf1, sizeof buf1, msg, arg);
 	va_end(arg);
 
-	xprintf("go tool dist: %s\n", buf1);
+	errprintf("go tool dist: %s\n", buf1);
 	
 	bgwait();
 	ExitProcess(1);