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such as RenderThemeGtk2.cpp, in debug mode. RenderThemeGtk2.cpp tries to allow usage
of deprecated functions by undefining GTK_DISABLE_DEPRECATED, but it ended up being
redefined because autotoolsconfig.h was included again by headers that came after
config.h.

Reviewed by Martin Robinson.

* Source/autotools/SetupWebKitFeatures.m4: add checks to ensure the
autotoolsconfig.h header is only included once.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144990 268f45cc-cd09-0410-ab3c-d52691b4dbfc