it early enough.  Remove explicit AC_SUBST of several variables that
automake handles automatically, or that was used for functionality
that automake provides in different ways: CFLAGS, CPPFLAGS, LDFLAGS,
DEPENDFLAGS, INCLUDE_CURRENT, EXTRAARFLAGS, SRCTOPDIR,
BUILDTOPDIR. Added call to AM_C_PROTOTYPES.  Rely on automakes ability
to fix dependencies automatically and handle ARFLAGS properly.  Use
CMOD_COMPILER_CC_ACCEPTS to check for a lot of warning flags to use.
Use CMOD_C_ATTRIBUTE_UNUSED.  Use AM_PROG_LEX instead of AC_PROG_LEX.
Removed check for sys/select.h, which only isc uses.  Added check for
values.h.  Run configure in src/libraries/libisc-new instead of
creating makefiles in that directory.  Generated db-crypt/Makefile and
run-support/Makefile.