xpdf's configure couldn't enable freetype feature

[Norikatsu Shigemura]

Hi Doug!

	By recently freetype was changed #include from <freetype.h> to
	<ft2build.h>, so xpdf's configure couldn't enable freetype
	feature.  Although xpdf supported, but it contains halfway
	solution.

	In xpdf-3.00_1:
	$ xpdf -h
		:
	  -z <string>         : initial zoom level (percent, 'page', 'width')
	  -t1lib <string>     : enable t1lib font rasterizer: yes, no
	  -aa <string>        : enable font anti-aliasing: yes, no
		:

	In xpdf-3.00_2: new patch attached in this mail.
	$ xpdf -h
		:
	  -z <string>         : initial zoom level (percent, 'page', 'width')
	  -t1lib <string>     : enable t1lib font rasterizer: yes, no
	  -freetype <string>  : enable FreeType font rasterizer: yes, no
	  -aa <string>        : enable font anti-aliasing: yes, no
		:

	PR:		ports-jp/14663[1], ports-jp/14689[2], ports-jp/14693[3]
	Pointed out by:	NAKAJI Hiroyuki <nakaji at tutrp.tut.ac.jp> [1]
	Suggested by:	Shinya Kuwamura <kuwa at labs.fujitsu.com> [2]
	Submitted by:	NAKAJI Hiroyuki <nakaji at tutrp.tut.ac.jp> [3]
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