bug#7849: new instspc* test failures

[Ralf Wildenhues]

There are a number of new failures since the splitup of instspc.test.
Most seem to stem from increased coverage.  Rather than putting each
failure in a different PR, I'm listing a number of them here; we can
still split things out further later if that proves necessary.


On MinGW, instspc-carriageret-* fail because the CR character is not
treated correctly by the shell and/or other tools like sed.  I don't
think this is fixable without fixing the shell.


On Cygwin, instspc-dotdotdot-build.test fails because executing a COFF
binary in a directory named '...' fails (causing the "compiler works"
test to fail at configure time):

$ mkdir ...
$ cd ...
$ cp /usr/bin/ls.exe .
$ ./ls.exe
bash: ./ls.exe: No such file or directory

I still need to report this upstream.


Cheers,
Ralf