libc_noux: try read again on EAGAIN/EINTR

Issue #3541.

repos/ports/src/lib/libc_noux/plugin.cc

@@ -1366,6 +1366,14 @@ namespace {
 						errno = 0;
 					break;
 				}
+
+				/* try again */
+				bool const retry = (errno == EINTR
+				                 || errno == EAGAIN
+				                 || errno == EWOULDBLOCK);
+				if (errno && retry)
+					continue;
+
 				return -1;
 			}