[Flac-dev] non-PIC code in shared libs again

[Matt Zimmerman]

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=179434

In order to fix this for Debian, I changed things around to build the .a
libraries as libtool convenience libraries; this takes care of PIC and they
can be portably linked into shared libraries (I believe libtool would
complain about this otherwise).

Josh, how would you feel about me merging these changes into flac CVS?

-- 
 - mdz