I have already opened an issue for this. However, it doesn't resolve the underlying and rather harder to fix problem of different language-specific package managers embedding copies of C and C++ libraries which can end up in a horrible incompatible mess. It's not specific to pip/pypy, it also applies to Java jars with embedded libraries and other systems which also embed.
Sometimes, this embedded copy can be more up to date than the system copy, but the convenience of embedding is often outweighed by the binary compatibility problems and being neglected and out of date.
Sometimes, this embedded copy can be more up to date than the system copy, but the convenience of embedding is often outweighed by the binary compatibility problems and being neglected and out of date.