bug#10766: CXX gets the value 'CC' on Cygwin, but CC is in fact cc

[Peter Rosin]

Hi!

The testsuite on master tries to use lesser compilers, but on Cygwin
this causes some failures due to the fact that /usr/bin/cc{.exe} is
also recognized as /usr/bin/CC{.EXE} (due to the filesystem not being
case sensitive), leading to CXX being set to 'CC'.

But then CXX isn't a C++ compiler and some tests go downhill, namely
silent-many-generic.test and suffix3.tap.

Or something, I didn't look all that much at it.  Maybe the failure
in silent-many-generic.test is just a variant of the SunStudio CC
case mentioned in the comment?

Cheers,
Peter

silent-many-generic.log
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suffix3.log
Description: Text document