Reinstate a pcp.spec.in fix Ken had made earlier
Reinstate a pcp.spec.in fix Ken had made earlier

There was a fix for an issue Ken had resolved in the non-
infiniband build that was more subtle than I realised, and
which tripped Franks f19 build.  The egrep-generating-an-
empty-file is not safe as I thought, since it returns a
non-zero exit code when no lines match and the build fails.

Resolve this by reinstating Kens original approach, that of
conditional-spec-code, simply touching the file if needed.

edwardt/pcp,prasincs/pcp,tjanez/pcp,edwardt/pcp,tjanez/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,tjanez/pcp,adfernandes/pcp,wuliming/pcp,edwardt/pcp,andyvand/cygpcpfans,mbaldessari/pcp,aeg-aeg/pcpfans,adfernandes/pcp,aeg-aeg/pcpfans,wuliming/pcp,tjanez/pcp,andyvand/cygpcpfans,tjanez/pcp,mbaldessari/pcp,wuliming/pcp,aeg-aeg/pcpfans,wuliming/pcp,mbaldessari/pcp,adfernandes/pcp,edwardt/pcp,aeg-aeg/pcpfans,prasincs/pcp,edwardt/pcp,adfernandes/pcp,edwardt/pcp,andyvand/cygpcpfans,wuliming/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,wuliming/pcp,edwardt/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,adfernandes/pcp,tjanez/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,adfernandes/pcp,andyvand/cygpcpfans,edwardt/pcp,mbaldessari/pcp,tjanez/pcp,prasincs/pcp,prasincs/pcp,andyvand/cygpcpfans,adfernandes/pcp,prasincs/pcp,andyvand/cygpcpfans,wuliming/pcp,wuliming/pcp,prasincs/pcp,prasincs/pcp,adfernandes/pcp,tjanez/pcp,prasincs/pcp