Is it possible to use a different build directory?

[glasswalk3r]

Regularly compiling options from perl source allow to select a different build directory. If possible to do such thing through perlbrew, it would be possible to use a RAM based file system, for example, which should reduce compilation due I/O improvement.

[gugod]

Previously: #577

All -D flags passed to perlbrew install are passthru to Configure, as well as all -U and -A flag.

However, perlbrew install still cd to the source directory and run Configure from there. It is at the moment not possible to utilize -Dmksymlinks by just passing a few command-line arguments.