[PATCH, testsuite]: Fix detection of -j make argument

[Jonathan Wakely]

On 22/11/16 16:54 +0100, Marc Glisse wrote:
>On Tue, 22 Nov 2016, Uros Bizjak wrote:
>
>>New makes (e.g. GNU Make 4.2.1) pass -j argument in MFLAGS is a
>>different way. While older makes pass only "-j", newer makes pass e.g.
>>"-j4" when -j is specified on the command line. The detection of "-j"
>>make argument doesn't work in the later case.
>>
>>Attached patch reworks this functionality to detect -j correctly in all cases.
>
>Hello,
>
>I didn't read the patch, but do you think this also fixes PR 53155 ?

No, probably not, as it only changes the "-j N" case, not the "-j"
case in your PR, which doesn't match because the -j gets combined with
other make flags.