Yaakov Selkowitz: fixes for in-tree libiconv

        * Makefile.def (libiconv): Define bootstrap=true.
        Mark pdf/html/info as missing.
        (configure-gcc): Depend on all-libiconv.
        (all-gcc): Ditto.
        (configure-libcpp): Ditto.
        (all-libcpp): Ditto.
        (configure-intl): Ditto.
        (all-intl): Ditto.
        * Makefile.in: Regenerate.

binutils/
        * configure: Regenerate.

gdb/
        * Makefile.in (LIBICONV): Define.
        (CLIBS): Add LIBICONV.
        * acinclude.m4: Use config/iconv.m4 instead of custom AM_ICONV.
        * configure: Regenerate.