hdf5_ep

[svn-r16838] Bug fix:
If the AR command has embedded shell separators such as the case of
"AR =  ar -X 64", $AR ends up as a blank.

Solution:
Put quotes around the command substitution string to protect against embedded
separators. Applied the same to both AR and RANLIB assignments.

Tested:
At Up (AIX 5.3) only because that was where I discovered the error
when AR is  ar -X 64