hg: jdk/submit: 8252248: __SIGRTMAX is not declared in musl libc

[alexander.scherbatiy at bell-sw.com]

Changeset: 255e6e305f82
Author:    alexsch
Date:      2020-08-31 09:45 +0300
URL:       https://hg.openjdk.java.net/jdk/submit/rev/255e6e305f82

8252248: __SIGRTMAX is not declared in musl libc
Reviewed-by: alanb, vtewari, stuefe

! src/java.base/linux/native/libnet/linux_close.c
! src/java.base/unix/native/libnio/ch/NativeThread.c