hydra-queue-runner: Fix crash when < > are in hydra-build-products

This prevents a forever-hanging build (don't know why) when < or > are
in the path of hydra-build-products. This is not to prevent any XSS (see
next commits), just to prevent the DOS (if you can even call it that).

src/hydra-queue-runner/build-result.cc

@@ -51,8 +51,8 @@ BuildOutput getBuildOutput(
         "[[:space:]]+"
         "([a-zA-Z0-9_-]+)" // subtype (e.g. "readme")
         "[[:space:]]+"
-        "(\"[^\"]+\"|[^[:space:]\"]+)" // path (may be quoted)
-        "([[:space:]]+([^[:space:]]+))?" // entry point
+        "(\"[^\"]+\"|[^[:space:]<>\"]+)" // path (may be quoted)
+        "([[:space:]]+([^[:space:]<>]+))?" // entry point
         , std::regex::extended);
 
     for (auto & output : outputs) {