* configure.ac: Replace GLIBMM_ARG_ENABLE_API_DEPRECATED() with
the new MM_ARG_DISABLE_DEPRECATED_API() macro from mm-common.
(MM_PREREQ): Raise requirement to mm-common 0.6.
* build/reduced.m4 (GLIBMM_ARG_ENABLE_API_DEPRECATED): Remove
obsolete macro definition.
* glib/glibmmconfig.h.in (GLIBMM_DISABLE_DEPRECATED): Copy #undef
statement from config.h.in template.
* gio/giommconfig.h.in (GIOMM_DISABLE_DEPRECATED): ditto.