[Tile-serving] [osm2pgsql] Update macros from autoconf archive (#435)

[Paul Norman]

The C++11 changes landed upstream, so replaces #434

Fixes #432

Other changes are fairly minor
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/435

-- Commit Summary --

  * Update macros from autoconf archive

-- File Changes --

    M m4/ax_append_flag.m4 (4)
    M m4/ax_cflags_warn_all.m4 (4)
    M m4/ax_cxx_compile_stdcxx_11.m4 (6)
    M m4/ax_lua.m4 (8)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/435.patch
https://github.com/openstreetmap/osm2pgsql/pull/435.diff

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https://github.com/openstreetmap/osm2pgsql/pull/435
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