Log Message:
Upstream bumped the version 2.3.1 to 3.0, 
but it is really 3.0pre. So we set PKGVERSION as 2.99.1.
(1) Makefile
      Bump version 2.3.1 to 2.99.1
(2) PLIST
      Have ${PKGVERSION} in PLIST
(3) patch-configure.{in,.ac}
      Rename patch-configure.in to patch-configure.ac
      to follow upstream change (actually delete and add).
(4) patches/patch-lisp_Makefile.{am,in}
     In tc-pre.el, following line set the version name.
      (defconst tcode-version "3.0")
     But at byte-compile, if older version like 2.3.1 
     is installed already, the old constant is honored
     and tc-pre.elc has 2.3.1 for tcode-version.
    As a work around, tc-pre is excluded for byte compile list.