vchoi_fork

[svn-r2550] Purpose:
	Cleaned up the configure file a bit.

Description:
	There were a few small bugs having to do with checking if strings
	were empty. Also needed to force paths to be absolute instead of
	relative.

Solution:
	I standardized string checking (test -z for an empty string and
	test -n for a non-empty string). Also, if the user specifies a
	relative path for any of the options, the configure now makes it
	into an absolute path for both CPPFLAGS and LDFLAGS macros.

Platforms:
	Solaris, Linux