Regression on Cygwin: Problems with parallel make in 4.4

[Ken Brown]

Several packages that used to build fine on Cygwin with parallel make 
now fail to build.  I either get strange errors or a hang.  The problems 
started with version 4.4 and seem to stem from the fact that make now 
uses a FIFO by default instead of a pipe.  If I use the flag 
'--jobserver-style=pipe', parallel make works again.  A recent example 
is described here:

  https://tug.org/pipermail/tlbuild/2023q1/005290.html

There may be a bug in Cygwin's FIFO implementation underlying this, but 
nevertheless it's a regression from 4.3 to 4.4, and most Cygwin users 
won't know that they have to use the --jobserver-style flag.  I suggest 
that you provide a configure option to set the jobserver style at the 
time make is built, and set it to 'pipe' by default on Cygwin.

Thanks.

Ken