Fix issue linking pgmspace.h functions in a sketch. #403
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This pull fixes issue #401, that pgmspace.h functions like strcpy_P, strlen_P, etc. fail to link with an error they can't be found. The fix is to extend the extern "C" in pgmspace.h so it covers all the function declarations. To test it use the example sketch in #401 and you can see if fail before the fix and succeed after the fix (and work as expected when run on the hardware).