minor cleanups to configure.ac to reduce autoconf-2.70 warnings a bit.

configure output is practically unchanged. there are still lots of
AC_TRY_COMPILE/AC_TRY_LINK replacements needed to really eliminate
the warnings, but that's for another time.

acinclude/esd.m4

@@ -1,7 +1,3 @@
-##############################################################################
-#
-# --- esd.m4 ---
-#
 # Configure paths for ESD
 # Manish Singh    98-9-30
 # stolen back from Frank Belew