net-misc/linuxptp: honour user value of CPP

Upstream build scripts call the preprocessor to acquire the list
of system include directories, which is then used to locate the
declaration of clock_adjtime(). However, they hard-coded the
preprocessor name to "cpp" - and if that is absent (e.g. on a system
without native gcc symlinks) the script invoking it gets an empty list
of directories, assumes the absence of clock_adjtime() definition and
compensates by enabling a custom one, and subsequently causes a build
failure when the two definitions collide.

Closes: https://bugs.gentoo.org/864557
Signed-off-by: Marek Szuba <marecki@gentoo.org>

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