Allow compatibility with old pgmspace API to be disabled by the user

When this compatibility mode is enabled, code that is entirely
compliant with the new pgmspace API can still raise deprecation
warnings when symbols present in both the old and new APIs (for
example, PGM_P) are used. Clearly, these warnings are false
positives. They can be avoided by disabling the compatibility mode.

This functionality is achieved by prepending the flag that enables
the compatibility mode to CPPFLAGS instead of appending it, thus
allowing the user to override the default behaviour and disable the
compatibility mode by putting the negation of the flag in the
CPPFLAGS variable in their top-level Makefile.

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