++ illegal in VMS filenames

[Bruce Korb]

> cp/g++spec.c is an illegal filename on VMS, and there's no way to prevent
> "make LANGUAGES=c" from trying to compile it short of hacking the
> Makefile or completely removing the cp subdirectory before configure.

I would recommend grepping through the source tree for
non-posix file name characters, then finding those files
in the Makefile's & posting a rename + patch.

POSIX file name characters:  [a-zA-Z0-9_.-]
It's pretty constrained.  I thought this was
resolved, but I guess it has reared its head again.