MFH: r406034 (partly)

Remove unused and hence confusing OSSP_UUID parameters from Makefile [2]

The path to perl in hard coded into pgxs/src/Makefile.global which is
then installed. Hence, we must depend on perl when that file is installed.

PR: 192387 [2]
PR: 206046 [4]
Approved by: portmgr