tweak for cffi-grovel::trim-whitespaces?

[Mirko Vukovic]

Hello,

This is on
- 64-bit Windows
- Msys+mingw64 GCC compilation suite
- ccl and/or sbcl (latest Windows version)
- cffi 0.16.1.

I had problems loading cffi-libffi:
- CCL did fine
- SBCL barfed during the grovel phase:
  > Paths returned by pkg-config had a control-M appended to the end

I fixed that by adding \#Return to the list of characters trimmed by
cffi-grovel::trim-whitespaces.

With that addition both SBCL and CCL loaded cffi-libffi.

Mirko
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