* libtool.m4: Build standard shared libraries on AIX POWER

* libtool.m4: Build standard shared libraries on AIX POWER
more like AIX does, with a shared object archived into lib<xxx>.a.
On AIX -bexpall flag does strange things... Don't use it.
Fix quotes around -berok flag.  Add support for AIX 5.
Add support for run time linking on AIX POWER. (should work
on AIX 4.2 and up).  Turn this feature on by adding -brtl flag
to LD_FLAGS.  Add support for AIX on IA64. Note: AIX on IA64
uses a SYSV type linker.  Add a comment telling what to do if the
TOC starts getting too large on AIX.
* NEWS: mention aix5 support.