implement sk_malloc_throw, avoid importing SkMallocPixelRef.cpp
implement sk_malloc_throw, avoid importing SkMallocPixelRef.cpp

for this minor function, if we were to add the module that implements it like
we do here, the size of the _pathops.so extension modiule would increase from 6
to more than 40 MB, as we would need to pull in a lot of other skia modules
which aren't required to use pathops.

fonttools/skia-pathops