config.sub patch: recognize four-part configuration name for VxWorks OS

[Xin, Peixing]

Hi ,

This patch is to recognize four-part configuration name for VxWorks. For 
example:
    armv7m-wrs-vxworks-eabihf
    armv7-wrs-vxworks-eabihf
    i686-wrs-vxworks-simlinux
    i686-wrs-vxworks-simwindows
    powerpc-wrs-vxworks-spe
    x86_64-wrs-vxworks-simlinux
    x86_64-wrs-vxworks-simwindows

    It's my check result on Ubuntu 18.04:

    $ make check
    cd testsuite && bash config-guess.sh && rm uname
    PASS: config.guess checks (131 tests)
    cd testsuite && bash config-sub.sh
    PASS: config.sub checks (846 tests)
    PASS: config.sub idempotency checks (783 tests)
    PASS: config.sub canonicalise each config.guess testcase (131 tests)

    * config.sub: Recognize four-part configuration name for VxWorks.
    * testsuite/config-sub.data: Add test cases.

Thanks,
Peixing

0001-Recognize-four-part-configuration-name-for-VxWorks.-.patch
Description: 0001-Recognize-four-part-configuration-name-for-VxWorks.-.patch