Avoid "-z text" diversion on SunOS x86, needed to make FATE happy.

patch by Michael Kostylev, michael.kostylev gmail com

Originally committed as revision 20373 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1880,6 +1880,7 @@ case $target_os in
     sunos)
         FFSERVERLDFLAGS=""
         SHFLAGS='-shared -Wl,-h,$$(@F)'
+        enabled x86 && SHFLAGS="-mimpure-text $SHFLAGS"
         network_extralibs="-lsocket -lnsl"
         add_cppflags -D__EXTENSIONS__
         ;;