upcxx-meta CXX and CC are not full path expanded

Currently upcxx-meta CXX returns the value of the $CXX variable used (or defaulted) at install time. Unfortunately this is often a value like g++ (without an absolute path) which relies on the $PATH of the installing user to find the compiler.

This is fine for building the runtime (which happens immediately), but can cause problems post-install when a different user with a different $PATH tries to use upcxx-meta CXX, either directly or indirectly (via upcxx). This can result in "command not found" errors for the end user, or worse still silently picking up an incompatible compiler.

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