make portaudio autobuild on 64bit right

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@2010 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/portaudio.build.sh

+arch=`uname -m`
+
+opts=""
+if [ $arch = "x86_64" ] ; then
+opts="-fPIC"
+fi
+
+CFLAGS=$opts ./configure $@
+make
+make install
+
+
+
+