Explicit ignore the return code for failed error messages

This gave a compiler warning. We only use the function in case something
is already wrong so signalling further that the error failed doesn't
help us anymore.

Author: vmcj

judge/runguard.cc

@@ -233,7 +233,7 @@ void verbose(const char *format, ...)
 void verbose_from_signalhandler(const char* msg)
 {
 	if (!be_quiet && be_verbose) {
-		write(STDERR_FILENO, msg, strlen(msg));
+		std::ignore = write(STDERR_FILENO, msg, strlen(msg));
 	}
 }
 
@@ -242,7 +242,7 @@ void warning_from_signalhandler(const char* msg)
 	if (!be_quiet) {
 		// Do not include timing here, as it wouldn't be safe from a signalhandler.
 		// TODO: Consider rewriting using clock_gettime in the future.
-		write(STDERR_FILENO, msg, strlen(msg));
+		std::ignore = write(STDERR_FILENO, msg, strlen(msg));
 	}
 }