[Uim] another small patch for 32/64 bit platforms

[yusuke at cherubim.icw.co.jp]

Hi!

I have applied both of your patches. I am happy to hear that you can
use uim on 64bit platform with the patch. Thanks!
> On platforms which support both 32 bit and 64 bit binaries (like the
> AMD 64 bit machines), the 64 bit versions of the libraries are in
> /usr/lib64 and /usr/X11R6/lib64. The libraries in these directories
> should be preferred in that case.
> 
> The patch contains two other small hunks to make newer versions of
> autoconf happy. 
> 
--
 CHAOS AND CHANCE!
  Yusuke TABATA (yusuke at cherubim.icw.co.jp)