Import of Itcl 3.3.
* itcl/configure.in, itk/configure.in, iwidgets/configure.in:
Replace with configure.ac.
* itcl/configure, itk/configure, iwidgets/configure: Regenerate.
* configure.ac, Makefile.am, Makefile.in: New files.
* README: "New" file.
* aclocal.m4: Regenerate.
* itcl/Makefile.in (RANLIB): Replace with RANLIB_LIB so
that the toplevel build does not override this variable.
* itk/Makefile.in (RANLIB): Likewise.
* itcl/tclconfig/tcl.m4 (TEA_PATH_TCLCONFIG): Look for itclConfig.sh
in the platform-specific location (unix or win).
(TEA_PATH_TKCONFIG): Likewise.
(TEA_MAKE_LIB): Even on windows, GCC libraries must start with "lib".
* itk/tclconfig.m4: Copy of itcl/tcl.m4.
* iwidgets/tcl.m4: Remove.
* iwidgets/tclconfig: New directory.
* iwidgets/tclconfig/tcl.m4, iwidgets/tclconfig/install-sh: Copies
of itcl/tclconfig files.
* iwidgets/Makefile.in (MKINSTALLDIRS): Use mkdir -p.
* iwidgets/configure.ac (PACKAGE): Rename to PACKAGE_NAME.
Call TEA_INIT, add AC_CONFIG_AUX_DIR and AC_PROG_INSTALL.
Use TEA_* instead of SC_* macros.
Search a few more directories for the itcl and itk libraries.