Regenerated libstdc++-v3/* with automake-1.11.6

[Jonathan Wakely]

I need to make some changes to src/Makefile.am on the gcc-5-branch so
this regenerates everything with automake-1.11.6 first.

Tested powerpc64le-linux, committed to gcc-5-branch.

    	* Makefile.in: Regenerate with automake-1.11.6.
    	* aclocal.m4: Likewise.
    	* configure: Likewise.
    	* doc/Makefile.in: Likewise.
    	* include/Makefile.in: Likewise.
    	* libsupc++/Makefile.in: Likewise.
    	* po/Makefile.in: Likewise.
    	* python/Makefile.in: Likewise.
    	* src/Makefile.in: Likewise.
    	* src/c++11/Makefile.in: Likewise.
    	* src/c++98/Makefile.in: Likewise.
    	* testsuite/Makefile.in: Likewise.

(No patch as these are all generated by automake.)