Add a --enable-explicit-deps option to control whether dependency

Add a --enable-explicit-deps option to control whether dependency

Fri Mar  1 00:46:49 2002  Owen Taylor  <otaylor@redhat.com>

        * configure.in: Add a --enable-explicit-deps option to control
        whether dependency libraries are written into .la files and .pc
        files.  Default is auto: if static libraries are off and shlib
        dependencies are found, don't write deps.

        * gdk/Makefile.am gtk/Makefile.am sanitize-la.sh: Shell script
        used to strip dependencies out of .la files.

        * Makefile.am: Add a slightly modified distcheck rule that passes
        --enable-gtk-doc to the configure inside.
        (So that 'make dist' succeeds inside.)

        * configure.in: If pango was compiled with
        --disable-explicit-deps, then repeat the checks for X and
        freetype ourselves so we don't depend on linking to libraries
        that pango doesn't reveal in the link line. Add some more paranoia
        for whether what we detect ourselves matches what Pango backends
        we found.