Update and clean up autoconf template files.

Update and clean up autoconf template files.

This is needed for compatibility with newer autoconf:
* Removed several unused m4 macros.
* Removed support for traditional C decl in CL_PROTO_TRY.
* Remove check for perror(), which is standard C++11.
* Remove ax_cxx_compile_stdcxx.m4 (it is pulled in by autogen.sh).
* Ran autoupdate on remaining files.

Tested successfully with autoconf 1.69 and 1.71.