(issue139) Check that pid is not running if the lock can be aquired If the lock on the lockfile can be aquired it might still be possible that another process is running. So we read the pid from the lockfile and check if another process with the same installation prefix as us is running.

When linking against a shared nss build the nss installation program
has the following NSS run time dependencies:

 - nssckbi.dll
 - smime3.dll
 - nss3.dll
 - nssdbm3.dll
 - softokn3.dll
 - sqlite3.dll
 - freebl3.dll
 - nssutil3.dll
 - libplc4.dll
 - libplds4.dll
 - libnspr4.dll