Merge branches 'ng/stdinc' and 'ng/suffix-rules-mutilation' into ng/master

* ng/stdinc:
  [ng] compile: rename make variable DEFAULT_INCLUDES -> AM_DEFAULT_INCLUDES
  [ng] compile: add extra -I opts from config headers at make runtime
  [ng] compile: rename make variable CONFIG_HEADER -> AM_CONFIG_HEADERS
  [ng] maintcheck: refactor checks on obsolete variable names

* ng/suffix-rules-mutilation:
  [ng] suffix: drop Automake-time chaining of suffix rules

diff --cc NG-NEWS
Simple merge

diff --cc automake.in
Simple merge