Why do we reference ../intl?

[Eli Zaretskii]

The top-level `intl' directory was removed from GDB, but we still have
it in Makefile.in:

    # Where is the INTL library?  Typically in ../intl.
    INTL_DIR = ../intl
    INTL = @INTLLIBS@
    INTL_DEPS = @INTLDEPS@
    INTL_SRC = $(srcdir)/$(INTL_DIR)
    INTL_CFLAGS = -I$(INTL_DIR) -I$(INTL_SRC)

This causes GCC to compile with -I../intl, i.e. look into a
non-existing directory.

Should this whole intl-related stuff be removed, or at least
commented-out, until we resurrect support for included gettext?