* configure.in: Simplify by removing CPP etc.
(CPP_TEST_OPTIONS, NON_GNU_CPP, cc_specified, SPECIFIED_CFLAGS) (SPECIFED_CPP, CPP, NON_GNU_CC, AC_PROG_CPP): Remove; not needed. In particular we no longer need to fiddle with CPP, since we don't use CPP specially any more. (gl_EARLY): Invoke this after adjusting CC, so that it uses the adjusted compiler. (AC_PROG_INSTALL, AC_PROG_MKDIR_P, AC_PROG_RANLIB): Comment out, since gl_EARLY and/or Autoconf already does these.
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