Merge branch '189-fix-win32-build' into 'master'

Fix runtime assertion on Windows due isc_file_template being out-of-sync

Closes #189

See merge request isc-projects/bind9!193

lib/isc/win32/file.c

@@ -323,7 +323,6 @@ isc_file_template(const char *path, const char *templet, char *buf,
 {
 	char *s;
 
-	REQUIRE(path != NULL);
 	REQUIRE(templet != NULL);
 	REQUIRE(buf != NULL);